171000
2
20000000
10000000
11.65
570000
42119884
7542000
5623000
9254000
37437011
514123
100000000
0.001
37437011
17889000
7895000
12121000
-1000
4495000
158241000
1298000
6041000
17850000
-152236000
2928000
34756000
251000
37000
40797000
36845000
250000
2349000
40797000
15277000
21919000
11955000
2000
36844000
1352000
2970000
35226000
3500000
39000
39000
1000
0
21919000
21919000
51000
51000
21567000
21567000
301000
301000
14926000
14925000
1000
14926000
14925000
1000
3000000
51000
51000
15226000
15226000
17850000
17850000
39000
39000
2630103
17900000
2017-11-01
5800000
12000000
137254
967000
65765
495527
5045417
12400000
300000
51000
15226000
17889000
17889000
7794000
0.0850
10000000
232000
37055027
100000000
0.001
37055027
7500000
7443000
14331000
1000
8530000
155836000
2235000
33847000
7418000
-122027000
4653000
30673000
312000
37000
64520000
59762000
205000
2485000
64520000
15323000
47932000
11831000
64000
59763000
2003000
61766000
82000
82000
1000
0
47932000
47932000
2086000
2086000
44440000
44440000
1406000
1406000
11830000
11831000
1000
11830000
11831000
1000
2086000
2086000
13237000
13237000
7418000
7418000
82000
82000
7400000
16000000
500000
2086000
13237000
7500000
7500000
ACRX
ACELRX PHARMACEUTICALS INC
false
Smaller Reporting Company
2013
10-Q
2013-06-30
0001427925
--12-31
Q2
3.06
<div>
<p style="MARGIN-TOP: 12px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">The following outstanding
shares of common stock equivalents were excluded from the
computation of diluted net loss per share of common stock for the
periods presented because including them would have been
antidilutive:</font></p>
<p style="MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px; FONT-SIZE: 12px">
 </p>
<table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="76%" align="center">
<tr>
<td width="76%"></td>
<td valign="bottom" width="3%"></td>
<td></td>
<td></td>
<td></td>
<td valign="bottom" width="3%"></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="6" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>June 30,</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
</tr>
<tr>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>2013</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>2012</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Stock options to purchase
common stock</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">5,045,417</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">3,307,457</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr>
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Restricted stock
units</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">65,765</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">166,335</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Common stock
warrants</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">2,674,502</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">3,136,300</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
</table>
</div>
<div>
<p style="MARGIN-TOP: 12px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">The following tables set
forth a summary of the changes in the fair value of the
Company’s Level III financial liabilities for the three and
six months ended June 30, 2013 and June 30, 2012 (in
thousands):</font></p>
<p style="MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px; FONT-SIZE: 12px">
 </p>
<table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="76%" align="center">
<!-- Begin Table Head -->
<tr>
<td width="74%"></td>
<td valign="bottom" width="8%"></td>
<td></td>
<td></td>
<td></td>
<td valign="bottom" width="8%"></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>Three Months<br />
Ended<br />
June 30,<br />
2013</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>Six Months<br />
Ended<br />
June 30,<br />
2013</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
</tr>
<!-- End Table Head --><!-- Begin Table Body -->
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Fair value—beginning
of period</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">9,254</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">7,500</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr>
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Change in fair value of
Level III liabilities</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">8,635</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">10,389</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr style="FONT-SIZE: 1px">
<td valign="bottom"></td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Fair value—end of
period</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">17,889</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">17,889</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr style="FONT-SIZE: 1px">
<td valign="bottom"></td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
</tr>
<tr>
<td height="16"></td>
<td height="16" colspan="4"></td>
<td height="16" colspan="4"></td>
</tr>
<tr>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>Three Months<br />
Ended<br />
June 30,<br />
2012</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>Six Months<br />
Ended<br />
June 30,<br />
2012</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Fair value—beginning
of period</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">171</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">232</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr>
<td valign="top" nowrap="nowrap">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Addition of private
placement warrant liability on June 1, 2012</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">5,828</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">5,828</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Change in fair value of
Level III liabilities</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">(376</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">) </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">(437</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">) </font></td>
</tr>
<tr style="FONT-SIZE: 1px">
<td valign="bottom"></td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
</tr>
<tr>
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Fair value—end of
period</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">5,623</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">5,623</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr style="FONT-SIZE: 1px">
<td valign="bottom"></td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
</tr>
</table>
</div>
<div>
<p style="MARGIN-TOP: 12px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">The following table sets
forth the fair value of the Company’s financial assets and
liabilities by level within the fair value hierarchy (in
thousands):</font></p>
<p style="MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px; FONT-SIZE: 12px">
 </p>
<table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="92%" align="center">
<tr>
<td width="66%"></td>
<td valign="bottom" width="4%"></td>
<td></td>
<td></td>
<td></td>
<td valign="bottom" width="4%"></td>
<td></td>
<td></td>
<td></td>
<td valign="bottom" width="4%"></td>
<td></td>
<td></td>
<td></td>
<td valign="bottom" width="2%"></td>
<td></td>
<td></td>
<td valign="bottom" width="2%"></td>
</tr>
<tr>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="14" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>As of June 30,
2013</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
</tr>
<tr>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>Fair Value</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>Level I</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>Level II</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>Level III</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2"><b><u>Assets</u></b></font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
</tr>
<tr>
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Money market
funds</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">51</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">51</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">U.S. government agency
obligations</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">15,226</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">15,226</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
</tr>
<tr style="FONT-SIZE: 1px">
<td valign="bottom"></td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
</tr>
<tr>
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Total assets measured at
fair value</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">15,277</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">51</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">15,226</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
</tr>
<tr style="FONT-SIZE: 1px">
<td valign="bottom"></td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2"><b><u>Liabilities</u></b></font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
</tr>
<tr>
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">PIPE warrant</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">17,850</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">17,850</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Contingent put option
liability</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">39</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">39</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr style="FONT-SIZE: 1px">
<td valign="bottom"></td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
</tr>
<tr>
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Total liabilities measured
at fair value</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">17,889</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">17,889</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr style="FONT-SIZE: 1px">
<td valign="bottom"></td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
</tr>
</table>
<p style="MARGIN-TOP: 12px; MARGIN-BOTTOM: 0px; FONT-SIZE: 1px">
 </p>
<table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="92%" align="center">
<tr>
<td width="66%"></td>
<td valign="bottom" width="4%"></td>
<td></td>
<td></td>
<td></td>
<td valign="bottom" width="4%"></td>
<td></td>
<td></td>
<td></td>
<td valign="bottom" width="4%"></td>
<td></td>
<td></td>
<td></td>
<td valign="bottom" width="4%"></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="14" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>As of December 31,
2012</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
</tr>
<tr>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>Fair Value</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>Level I</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>Level II</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>Level III</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2"><b><u>Assets</u></b></font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
</tr>
<tr>
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Money market
funds</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">2,086</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">2,086</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">U.S. government agency
obligations</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">13,237</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">13,237</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
</tr>
<tr style="FONT-SIZE: 1px">
<td valign="bottom"></td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
</tr>
<tr>
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Total assets measured at
fair value</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">15,323</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">2,086</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">13,237</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
</tr>
<tr style="FONT-SIZE: 1px">
<td valign="bottom"></td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2"><u><b>Liabilities</b></u></font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
</tr>
<tr>
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">PIPE warrant</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">7,418</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">7,418</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Contingent put option
liability</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">82</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">82</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr style="FONT-SIZE: 1px">
<td valign="bottom"></td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
</tr>
<tr>
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Total liabilities measured
at fair value</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">7,500</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">7,500</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr style="FONT-SIZE: 1px">
<td valign="bottom"></td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
</tr>
</table>
</div>
37198413
<div>
<p style="MARGIN-TOP: 6px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">The following table sets
forth the computation of the Company’s basic and diluted net
loss per share of common stock during the three and six months
ended June 30, 2013 and 2012 (in thousands, except for share
and per share amounts):</font></p>
<p style="MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px; FONT-SIZE: 12px">
 </p>
<p style="MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px; FONT-SIZE: 12px">
 </p>
<table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="92%" align="center">
<!-- Begin Table Head -->
<tr>
<td width="53%"></td>
<td valign="bottom" width="6%"></td>
<td></td>
<td></td>
<td></td>
<td valign="bottom" width="6%"></td>
<td></td>
<td></td>
<td></td>
<td valign="bottom" width="6%"></td>
<td></td>
<td></td>
<td></td>
<td valign="bottom" width="3%"></td>
<td></td>
<td></td>
<td valign="bottom" width="3%"></td>
</tr>
<tr>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="6" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>Three Months Ended<br />
June 30,</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="6" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>Six Months Ended<br />
June 30,</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
</tr>
<tr>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>2013</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>2012</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>2013</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>2012</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
</tr>
<!-- End Table Head --><!-- Begin Table Body -->
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Net loss</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">(17,447</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">) </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">(7,194</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">) </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">(30,209</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">) </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">(14,259</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">) </font></td>
</tr>
<tr style="FONT-SIZE: 1px">
<td valign="bottom"></td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
</tr>
<tr>
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Shares used in computing
net loss per share of common stock, basic and diluted</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">37,262,754</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">20,627,244</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">37,198,413</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">20,114,608</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr style="FONT-SIZE: 1px">
<td valign="bottom"></td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Net loss per share of
common stock, basic and diluted</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">(0.47</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">) </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">(0.35</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">) </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">(0.81</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">) </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">(0.71</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">) </font></td>
</tr>
<tr style="FONT-SIZE: 1px">
<td valign="bottom"></td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
</tr>
<!-- End Table Body --></table>
</div>
<div>
<p style="MARGIN-TOP: 18px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2"><b>4. Long-Term
Debt</b></font></p>
<p style="MARGIN-TOP: 6px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2"><b><i>Hercules Loan and
Security Agreement</i></b></font></p>
<p style="MARGIN-TOP: 6px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">In June 2011, AcelRx
entered into a loan and security agreement with Hercules, under
which AcelRx borrowed $20.0 million in two tranches of $10.0
million each, represented by secured convertible term promissory
notes. The Company’s obligations associated with the
agreement are secured by a security interest in substantially all
of its assets, other than its intellectual property.</font></p>
<p style="MARGIN-TOP: 12px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">The Company borrowed the
first tranche of $10.0 million upon the closing of the transaction
on June 29, 2011 and borrowed the second tranche of $10.0
million in December 2011. The Company used a portion of the
proceeds from the first tranche to repay the remaining obligations
under that certain loan and security agreement between the Company
and Pinnacle Ventures, L.L.C., or Pinnacle Ventures, dated
September 16, 2008. The interest rate for each tranche
is 8.50%. The Company made interest only payments until
June 30, 2012, followed by equal monthly payments of principal
and interest, totaling $742,000, through the scheduled maturity
date on December 1, 2014.</font></p>
<p style="MARGIN-TOP: 12px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">Subject to certain
conditions and limitations set forth in the Hercules loan and
security agreement, the Company has the right to convert up to
$3.0 million of scheduled principal installments under the
notes into that number of freely tradable shares of common stock
equal to (x) the product of (A) the principal amount to
be so converted and (B) 103%, divided by (y) $5.73 per
share.</font></p>
<p style="MARGIN-TOP: 12px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">The Hercules loan and
security agreement includes customary affirmative and restrictive
covenants, but does not include any financial maintenance
covenants, and also includes standard events of default.</font></p>
<p style="MARGIN-TOP: 12px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">Upon an event of default,
including a change of control, Hercules has the option to
accelerate repayment of the loan, including payment of any
applicable prepayment charges, which range from 1%-3% of the
outstanding loan balance and accrued interest, as well as a final
payment fee of $0.2 million. This option is considered a contingent
put option liability as the holder of the loan may exercise the
option in the event of default and, is considered an embedded
derivative which must be valued and separately accounted for in the
Company’s financial statements. As of June 30, 2013 and
December 31, 2012, the estimated fair value of the contingent
put option liability was $39,000 and $82,000, respectively, which
was determined by using a risk-neutral valuation model, wherein the
fair value of the underlying debt facility is estimated both with
and without the presence of the default provisions, holding all
other assumptions constant. The resulting difference between the
two estimated fair values is the estimated fair value of the
default provisions, or the contingent put option. The fair value of
the underlying debt facility is estimated by calculating the
expected cash flows in consideration of an estimated probability of
default and expected recovery rate in default, and discounting such
cash flows back to the reporting date using a risk-free rate. The
contingent put option liability was recorded as a debt discount to
the loan and consequently a reduction to the carrying value of the
loan. The contingent put option liability will be revalued at the
end of each reporting period and any change in the fair value will
be recognized in the statement of operations.</font></p>
<p style="MARGIN-TOP: 12px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">In connection with the
loan, the Company issued Hercules seven-year warrants to purchase
an aggregate of 274,508 shares of common stock at a price of $3.06
per share. See Note 5 “Warrants,” for further
description.</font></p>
<p style="MARGIN-TOP: 12px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">As of June 30, 2013,
the Company had outstanding borrowings under the Hercules loan and
security agreement of $12.4 million, net of debt discounts of $0.3
million. As of December 31, 2012, the Company had outstanding
borrowings under the Hercules loan and security agreement of $16.0
million, net of debt discounts of $0.5 million.</font></p>
<p style="MARGIN-TOP: 12px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">Amortization of the debt
discounts, which were recorded as Interest Expense, was $97,000 and
$138,000 for the three months ended June 30, 2013 and 2012,
respectively, and $205,000 and $272,000 for the six months ended
June 30, 2013 and 2012.</font></p>
</div>
<div>
<p style="MARGIN-TOP: 12px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">The table below summarizes
the Company’s cash, cash equivalents and investments (in
thousands):</font></p>
<p style="MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px; FONT-SIZE: 12px">
 </p>
<table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="92%" align="center">
<tr>
<td width="53%"></td>
<td valign="bottom" width="8%"></td>
<td></td>
<td></td>
<td></td>
<td valign="bottom" width="8%"></td>
<td></td>
<td></td>
<td></td>
<td valign="bottom" width="8%"></td>
<td></td>
<td></td>
<td></td>
<td valign="bottom" width="4%"></td>
<td></td>
<td></td>
<td valign="bottom" width="4%"></td>
</tr>
<tr>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="14" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>As of June 30,
2013</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
</tr>
<tr>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>Amortized Cost</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>Gross 
Unrealized</b></font><br />
<font style="FONT-FAMILY: Times New Roman" size="1"><b>Gains</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>Gross 
Unrealized</b></font><br />
<font style="FONT-FAMILY: Times New Roman" size="1"><b>Losses</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>Fair</b></font><br />
<font style="FONT-FAMILY: Times New Roman" size="1"><b>Value</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Cash and cash
equivalents:</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
</tr>
<tr>
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Cash</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">21,567</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">21,567</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Money market
funds</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">51</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">51</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr>
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">U.S. government agency securities</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">301</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">301</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr style="FONT-SIZE: 1px">
<td valign="bottom"></td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Total cash and cash
equivalents</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">21,919</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">21,919</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr>
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Marketable
securities:</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">U.S. government agency securities</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">14,926</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">(1</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">) </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">14,925</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr style="FONT-SIZE: 1px">
<td valign="bottom"></td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
</tr>
<tr>
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Total marketable
securities</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">14,926</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">(1</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">) </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">14,925</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr style="FONT-SIZE: 1px">
<td valign="bottom"></td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Total cash, cash
equivalents and investments</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">36,845</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">(1</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">) </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">36,844</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr style="FONT-SIZE: 1px">
<td valign="bottom"></td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
</tr>
<tr>
<td height="16"></td>
<td height="16" colspan="16"></td>
</tr>
<tr>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="14" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>As of December 31,
2012</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
</tr>
<tr>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>Amortized Cost</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>Gross 
Unrealized</b></font><br />
<font style="FONT-FAMILY: Times New Roman" size="1"><b>Gains</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>Gross 
Unrealized</b></font><br />
<font style="FONT-FAMILY: Times New Roman" size="1"><b>Losses</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>Fair</b></font><br />
<font style="FONT-FAMILY: Times New Roman" size="1"><b>Value</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Cash and cash
equivalents:</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
</tr>
<tr>
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Cash</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">44,440</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">44,440</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Money market
funds</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">2,086</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">2,086</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr>
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">U.S. government agency securities</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">1,406</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">1,406</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr style="FONT-SIZE: 1px">
<td valign="bottom"></td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Total cash and cash
equivalents</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">47,932</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">47,932</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr>
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Marketable
securities:</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">U.S. government agency securities</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">11,830</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">1</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">11,831</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr style="FONT-SIZE: 1px">
<td valign="bottom"></td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
</tr>
<tr>
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Total marketable
securities</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">11,830</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">1</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">11,831</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr style="FONT-SIZE: 1px">
<td valign="bottom"></td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Total cash, cash
equivalents and investments</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">59,762</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">1</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">59,763</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr style="FONT-SIZE: 1px">
<td valign="bottom"></td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
</tr>
</table>
</div>
<div>
<p style="MARGIN-TOP: 12px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2"><b>1. Organization and
Summary of Significant Accounting Policies</b></font></p>
<p style="MARGIN-TOP: 6px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2"><b><i>The
Company</i></b></font></p>
<p style="MARGIN-TOP: 6px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">AcelRx Pharmaceuticals,
Inc., or AcelRx or the Company, is a development stage company that
was incorporated in Delaware on July 13, 2005 as SuRx, Inc. In
January 2006, the Company changed its name to AcelRx
Pharmaceuticals, Inc. The Company’s operations are based in
Redwood City, California.</font></p>
<p style="MARGIN-TOP: 12px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">The Company is a specialty
pharmaceutical company focused on the development and
commercialization of innovative therapies for the treatment of
acute and breakthrough pain. Since incorporation, primary
activities have consisted of establishing facilities, recruiting
personnel, conducting research and development of its product
candidates, developing intellectual property and raising capital.
To date, the Company has not yet commenced primary operations or
generated any significant revenues and, accordingly, the Company is
considered to be in the development stage.</font></p>
<p style="MARGIN-TOP: 12px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">The Company has one
business activity, which is the development and commercialization
of product candidates for the treatment of pain, and a single
reporting and operating unit structure.</font></p>
<p style="MARGIN-TOP: 12px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">The Company has incurred
recurring operating losses and negative cash flows from operating
activities since inception through June 30, 2013. In addition,
the Company had an accumulated deficit of $152.2 million and $122.0
million as of June 30, 2013 and December 31, 2012.
Through June 30, 2013, the Company has relied primarily on the
proceeds from equity offerings and loan proceeds to finance its
operations. Management believes that the Company’s current
cash, cash equivalents and investments, including the net proceeds
raised in the underwritten public offering completed in July 2013,
will be sufficient to fund the Company’s current operations
through at least 2014. The Company will need to raise additional
funding or otherwise enter into collaborations to fund future
operations. However, there is no assurance that additional funding
will be available to the Company on acceptable terms on a timely
basis, if at all, or that the Company will achieve profitable
operations. If the Company is unable to raise additional capital to
fund its operations, it will need to curtail planned activities to
reduce costs. Doing so may affect the Company’s ability to
operate effectively. The accompanying financial statements do not
include any adjustments that might result from the outcome of these
uncertainties.</font></p>
<p style="MARGIN-TOP: 18px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2"><b><i>Basis of
Presentation</i></b></font></p>
<p style="MARGIN-TOP: 6px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">The accompanying unaudited
condensed financial statements have been prepared in accordance
with accounting principles generally accepted in the United States
for interim financial information and the rules and regulations of
the U.S. Securities and Exchange Commission, or SEC. Accordingly,
they do not include all of the information and footnotes required
by accounting principles generally accepted in the United States
for complete financial statements. In the opinion of management,
all adjustments (consisting of normal recurring adjustments)
considered necessary for a fair presentation have been
included.</font></p>
<p style="MARGIN-TOP: 12px; MARGIN-BOTTOM: 0px; FONT-SIZE: 1px">
 </p>
<p style="MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">Operating results for the
three and six months ended June 30, 2013 are not necessarily
indicative of the results that may be expected for the year ending
December 31, 2013. The condensed balance sheet as of
December 31, 2012 was derived from the Company’s audited
financial statements as of December 31, 2012, included in the
Company’s Annual Report on Form 10-K filed with the SEC.
These financial statements should be read in conjunction with the
Company’s Annual Report on Form 10-K for the year ended
December 31, 2012, which include a broader discussion of the
Company’s business and the risks inherent therein.</font></p>
<p style="MARGIN-TOP: 18px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2"><b><i>Use of
Estimates</i></b></font></p>
<p style="MARGIN-TOP: 6px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">The preparation of
financial statements in conformity with accounting principles
generally accepted in the United States requires management to make
estimates and assumptions that affect the amounts reported in the
condensed financial statements and accompanying notes. Management
evaluates its estimates on an ongoing basis including critical
accounting policies. Estimates are based on historical experience
and on various other market-specific and other relevant assumptions
that the Company believes to be reasonable under the circumstances,
the results of which form the basis for making judgments about the
carrying values of assets and liabilities that are not readily
apparent from other sources. Actual results could differ from those
estimates.</font></p>
<p style="MARGIN-TOP: 18px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2"><b><i>Newly Adopted
Accounting Pronouncements</i></b></font></p>
<p style="MARGIN-TOP: 6px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">In February 2013,
Accounting Standards Codification Topic 220, Comprehensive Income
was amended to require companies to report, in one place,
information about reclassifications out of accumulated other
comprehensive income. Accordingly, a company can present this
information on the face of the financial statements, if certain
requirements are met, or the information must be presented in the
notes to the financial statements. The Company adopted this
guidance as of January 1, 2013 on a retrospective basis and
this adoption did not have a material effect on the Company’s
condensed consolidated financial statements.</font></p>
</div>
-19096000
<div>
<p style="MARGIN-TOP: 18px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2"><b>7. Net Loss per Share of
Common Stock</b></font></p>
<!-- xbrl,body -->
<p style="MARGIN-TOP: 6px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">The following table sets
forth the computation of the Company’s basic and diluted net
loss per share of common stock during the three and six months
ended June 30, 2013 and 2012 (in thousands, except for share
and per share amounts):</font></p>
<p style="MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px; FONT-SIZE: 12px">
 </p>
<p style="MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px; FONT-SIZE: 12px">
 </p>
<table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="92%" align="center">
<!-- Begin Table Head -->
<tr>
<td width="53%"></td>
<td valign="bottom" width="6%"></td>
<td></td>
<td></td>
<td></td>
<td valign="bottom" width="6%"></td>
<td></td>
<td></td>
<td></td>
<td valign="bottom" width="6%"></td>
<td></td>
<td></td>
<td></td>
<td valign="bottom" width="3%"></td>
<td></td>
<td></td>
<td valign="bottom" width="3%"></td>
</tr>
<tr>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="6" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>Three Months Ended<br />
June 30,</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="6" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>Six Months Ended<br />
June 30,</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
</tr>
<tr>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>2013</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>2012</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>2013</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>2012</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
</tr>
<!-- End Table Head --><!-- Begin Table Body -->
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Net loss</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">(17,447</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">) </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">(7,194</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">) </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">(30,209</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">) </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">(14,259</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">) </font></td>
</tr>
<tr style="FONT-SIZE: 1px">
<td valign="bottom"></td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
</tr>
<tr>
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Shares used in computing
net loss per share of common stock, basic and diluted</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">37,262,754</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">20,627,244</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">37,198,413</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">20,114,608</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr style="FONT-SIZE: 1px">
<td valign="bottom"></td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Net loss per share of
common stock, basic and diluted</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">(0.47</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">) </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">(0.35</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">) </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">(0.81</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">) </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">(0.71</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">) </font></td>
</tr>
<tr style="FONT-SIZE: 1px">
<td valign="bottom"></td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
</tr>
<!-- End Table Body --></table>
<p style="MARGIN-TOP: 12px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">The following outstanding
shares of common stock equivalents were excluded from the
computation of diluted net loss per share of common stock for the
periods presented because including them would have been
antidilutive:</font></p>
<p style="MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px; FONT-SIZE: 12px">
 </p>
<table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="76%" align="center">
<!-- Begin Table Head -->
<tr>
<td width="76%"></td>
<td valign="bottom" width="3%"></td>
<td></td>
<td></td>
<td></td>
<td valign="bottom" width="3%"></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="6" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>June 30,</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
</tr>
<tr>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>2013</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>2012</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
</tr>
<!-- End Table Head --><!-- Begin Table Body -->
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Stock options to purchase
common stock</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">5,045,417</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">3,307,457</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr>
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Restricted stock
units</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">65,765</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">166,335</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Common stock
warrants</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">2,674,502</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">3,136,300</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<!-- End Table Body --></table>
</div>
<div>
<p style="MARGIN-TOP: 18px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2"><b>3. Research Grant
Agreement</b></font></p>
<p style="MARGIN-TOP: 6px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">In May 2011, AcelRx entered
into an award contract with the US Army Medical Research and
Materiel Command, or USAMRMC, in which the USAMRMC granted $5.6
million to the Company in order to support the development of a new
product candidate, ARX-04, a Sufentanil NanoTab for the treatment
of moderate-to-severe acute pain. Under the terms of the grant, the
USAMRMC agreed to reimburse the Company for development,
manufacturing and clinical costs necessary to prepare for and
complete the planned Phase 2 dose-finding trial in a study of acute
moderate-to-severe pain, and to prepare to enter Phase 3
development. The grant gives the USAMRMC the option to extend the
term of the grant and provide additional funding for the research.
The original term of the grant was through August 31, 2012;
however, due to a longer than expected administrative review
process by the USAMRMC, AcelRx has received no-cost extensions of
the grant, whereby the term has been extended to January 31,
2014.</font></p>
<p style="MARGIN-TOP: 12px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">Revenue is recognized based
on expenses incurred by AcelRx in conducting research and
development activities set forth in the agreement. Revenue
attributable to the research and development performed under the
USAMRMC grant was $407,000 and $224,000 for the three months ended
June 30, 2013 and 2012, respectively, and $1.3 million and
$0.6 million for the six months ended June 30, 2013 and 2012,
respectively. From inception of the grant through June 30,
2013, we have generated grant revenue of $4.8 million.</font></p>
</div>
274508
<div>
<p style="MARGIN-TOP: 6px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">The Company recorded total
stock-based compensation expense for stock options, stock awards
and the 2011 Employee Stock Purchase Plan as follows (in
thousands):</font></p>
<p style="MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px; FONT-SIZE: 12px">
 </p>
<table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="100%" align="center">
<tr>
<td width="64%"></td>
<td valign="bottom" width="4%"></td>
<td></td>
<td></td>
<td></td>
<td valign="bottom" width="4%"></td>
<td></td>
<td></td>
<td></td>
<td valign="bottom" width="4%"></td>
<td></td>
<td></td>
<td></td>
<td valign="bottom" width="4%"></td>
<td></td>
<td></td>
<td></td>
<td valign="bottom" width="4%"></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="6" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>Three Months Ended</b></font><br />
<font style="FONT-FAMILY: Times New Roman" size="1"><b>June
30,</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="6" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>Six Months Ended</b></font><br />
<font style="FONT-FAMILY: Times New Roman" size="1"><b>June
30,</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" rowspan="2" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>Period from July 13,</b></font><br />
<font style="FONT-FAMILY: Times New Roman" size="1"><b>2005
(Inception)</b></font><br />
<font style="FONT-FAMILY: Times New Roman" size="1"><b>Through June 30,</b></font><br />
<font style="FONT-FAMILY: Times New Roman" size="1"><b>2013</b></font></td>
<td valign="bottom" rowspan="2"><font size="1"> </font></td>
</tr>
<tr>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>2013</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>2012</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>2013</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>2012</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Expenses:</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
</tr>
<tr>
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 3em"><font style="FONT-FAMILY: Times New Roman" size="2">Research and
development</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">411</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">254</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">766</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">505</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">4,143</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 3em"><font style="FONT-FAMILY: Times New Roman" size="2">General and
administrative</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">391</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">276</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">793</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">566</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">3,912</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr style="FONT-SIZE: 1px">
<td valign="bottom"></td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
</tr>
<tr>
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 5em"><font style="FONT-FAMILY: Times New Roman" size="2">Total stock-based
compensation expense</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">802</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">530</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">1,559</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">1,071</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">8,055</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr style="FONT-SIZE: 1px">
<td valign="bottom"></td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
</tr>
</table>
</div>
<div>
<p style="MARGIN-TOP: 18px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2"><b><i>Use of
Estimates</i></b></font></p>
<p style="MARGIN-TOP: 6px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">The preparation of
financial statements in conformity with accounting principles
generally accepted in the United States requires management to make
estimates and assumptions that affect the amounts reported in the
condensed financial statements and accompanying notes. Management
evaluates its estimates on an ongoing basis including critical
accounting policies. Estimates are based on historical experience
and on various other market-specific and other relevant assumptions
that the Company believes to be reasonable under the circumstances,
the results of which form the basis for making judgments about the
carrying values of assets and liabilities that are not readily
apparent from other sources. Actual results could differ from those
estimates.</font></p>
</div>
-0.81
<div>
<p style="MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2"><b>9. Subsequent
Event</b></font></p>
<p style="MARGIN-TOP: 6px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">On July 23, 2013,
AcelRx completed an underwritten public offering of 4,370,000
shares of common stock, including 570,000 shares of common stock
which were issued pursuant to the exercise of the
underwriters’ option to purchase additional shares, at a
price of $11.65 per share to the public. The total gross proceeds
of this offering were approximately $50.9 million with estimated
net proceeds to AcelRx of $47.9 million after deducting
underwriting discounts and commissions and other estimated expenses
payable by AcelRx.</font></p>
</div>
<div>
<p style="MARGIN-TOP: 18px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2"><b><i>Basis of
Presentation</i></b></font></p>
<p style="MARGIN-TOP: 6px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">The accompanying unaudited
condensed financial statements have been prepared in accordance
with accounting principles generally accepted in the United States
for interim financial information and the rules and regulations of
the U.S. Securities and Exchange Commission, or SEC. Accordingly,
they do not include all of the information and footnotes required
by accounting principles generally accepted in the United States
for complete financial statements. In the opinion of management,
all adjustments (consisting of normal recurring adjustments)
considered necessary for a fair presentation have been
included.</font></p>
<p style="MARGIN-TOP: 12px; MARGIN-BOTTOM: 0px; FONT-SIZE: 1px">
 </p>
<p style="MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">Operating results for the
three and six months ended June 30, 2013 are not necessarily
indicative of the results that may be expected for the year ending
December 31, 2013. The condensed balance sheet as of
December 31, 2012 was derived from the Company’s audited
financial statements as of December 31, 2012, included in the
Company’s Annual Report on Form 10-K filed with the SEC.
These financial statements should be read in conjunction with the
Company’s Annual Report on Form 10-K for the year ended
December 31, 2012, which include a broader discussion of the
Company’s business and the risks inherent therein.</font></p>
</div>
<div>
<p style="MARGIN-TOP: 18px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2"><b>6. Stock-Based
Compensation</b></font></p>
<p style="MARGIN-TOP: 6px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">The Company recorded total
stock-based compensation expense for stock options, stock awards
and the 2011 Employee Stock Purchase Plan as follows (in
thousands):</font></p>
<p style="MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px; FONT-SIZE: 12px">
 </p>
<table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="100%" align="center">
<tr>
<td width="64%"></td>
<td valign="bottom" width="4%"></td>
<td></td>
<td></td>
<td></td>
<td valign="bottom" width="4%"></td>
<td></td>
<td></td>
<td></td>
<td valign="bottom" width="4%"></td>
<td></td>
<td></td>
<td></td>
<td valign="bottom" width="4%"></td>
<td></td>
<td></td>
<td></td>
<td valign="bottom" width="4%"></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="6" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>Three Months Ended</b></font><br />
<font style="FONT-FAMILY: Times New Roman" size="1"><b>June
30,</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="6" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>Six Months Ended</b></font><br />
<font style="FONT-FAMILY: Times New Roman" size="1"><b>June
30,</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" rowspan="2" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>Period from July 13,</b></font><br />
<font style="FONT-FAMILY: Times New Roman" size="1"><b>2005
(Inception)</b></font><br />
<font style="FONT-FAMILY: Times New Roman" size="1"><b>Through June 30,</b></font><br />
<font style="FONT-FAMILY: Times New Roman" size="1"><b>2013</b></font></td>
<td valign="bottom" rowspan="2"><font size="1"> </font></td>
</tr>
<tr>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>2013</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>2012</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>2013</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>2012</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Expenses:</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
</tr>
<tr>
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 3em"><font style="FONT-FAMILY: Times New Roman" size="2">Research and
development</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">411</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">254</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">766</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">505</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">4,143</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 3em"><font style="FONT-FAMILY: Times New Roman" size="2">General and
administrative</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">391</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">276</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">793</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">566</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">3,912</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr style="FONT-SIZE: 1px">
<td valign="bottom"></td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
</tr>
<tr>
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 5em"><font style="FONT-FAMILY: Times New Roman" size="2">Total stock-based
compensation expense</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">802</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">530</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">1,559</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">1,071</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">8,055</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr style="FONT-SIZE: 1px">
<td valign="bottom"></td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
</tr>
</table>
<p style="MARGIN-TOP: 12px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">As of June 30, 2013
there were 514,123 shares available for grant, 5,045,417 options
outstanding and 65,765 restricted stock units outstanding under the
Company’s 2011 Equity Incentive Plan. In addition, there were
495,527 shares available for grant under the Company’s 2011
Employee Stock Purchase Plan.</font></p>
</div>
<div>
<p style="MARGIN-TOP: 18px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2"><b><i>Newly Adopted
Accounting Pronouncements</i></b></font></p>
<p style="MARGIN-TOP: 6px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">In February 2013,
Accounting Standards Codification Topic 220, Comprehensive Income
was amended to require companies to report, in one place,
information about reclassifications out of accumulated other
comprehensive income. Accordingly, a company can present this
information on the face of the financial statements, if certain
requirements are met, or the information must be presented in the
notes to the financial statements. The Company adopted this
guidance as of January 1, 2013 on a retrospective basis and
this adoption did not have a material effect on the Company’s
condensed consolidated financial statements.</font></p>
</div>
153000
-2000
-18340000
3820000
18022000
-697000
0
-30211000
1347000
45000
-11012000
-30209000
-81000
-55000
4261000
-3587000
1559000
-26013000
253000
19687000
-1731000
857000
-937000
233000
0
288000
14845000
-3330000
200000
15426000
0
200000
480000
<div>
<p style="MARGIN-TOP: 18px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2"><b>8. Manufacturing
Agreement</b></font></p>
<!-- xbrl,body -->
<p style="MARGIN-TOP: 6px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">In January 2013, the
Company and Patheon Pharmaceuticals Inc., or Patheon, entered into
a Manufacturing Services Agreement, or the Services Agreement, and
a related Amended and Restated Capital Expenditure and Equipment
Agreement, or the Capital Agreement, relating to the manufacture of
Sufentanil NanoTabs, or the Product, for use with the
Company’s Sufentanil NanoTab PCA System, or
ARX-01.</font></p>
<p style="MARGIN-TOP: 12px; MARGIN-BOTTOM: 0px; FONT-SIZE: 1px">
 </p>
<p style="MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">Under the terms of the
Services Agreement, the Company has agreed to purchase, subject to
Patheon’s continued material compliance with the terms of the
Services Agreement, all of its Product requirements for the United
States, Canada and Mexico from Patheon during the Initial Term of
the Services Agreement (as defined below), and at least eighty
percent (80%) of its Product requirements for such territories
after the Initial Term.</font></p>
<p style="MARGIN-TOP: 12px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">The term of the Services
Agreement extends until December 31, 2017, or the Initial
Term, and will automatically renew thereafter for periods of two
years, unless terminated by either party upon eighteen
months’ prior written notice; provided, however, that the
Services Agreement may not be terminated without cause prior to the
end of the Initial Term.</font></p>
<p style="MARGIN-TOP: 12px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">The Company also entered
into a Capital Expenditure and Equipment Agreement, or the Capital
Agreement, with Patheon. Under the terms of the Capital Agreement,
the Company has the option to make certain future modifications to
Patheon’s Cincinnati facility, the aggregate cost of which is
expected to be less than $3.5 million and which would be the
responsibility of the Company. If additional equipment and facility
modifications are required to meet the Company’s Product
needs, the Company may be required to contribute to the cost of
such additional equipment and facility modifications. The Capital
Agreement also requires that the Company make payments in 2013
totaling $480,000 to Patheon to partially offset taxes incurred and
paid by Patheon in connection with facility modifications already
completed by Patheon. The Company can seek reimbursement from
Patheon for this payment if it receives approval from the U.S. Food
and Drug Administration for ARX-01. The Capital Agreement further
requires that the Company pay a maximum “overhead fee”
of $200,000 annually during the term of the Services Agreement,
which amount may be reduced to $0 based on the amount of annual
revenues earned by Patheon under the Services Agreement and the
pre-existing development agreements.</font></p>
<p style="MARGIN-TOP: 12px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">Expenditures associated
with the aforementioned agreements are primarily driven by the
potential commercial requirements and demand for the
Company’s products, which are currently in development stage;
accordingly, the amounts and timing of such future expenditures
cannot be determined at this time.</font></p>
</div>
<div>
<p style="MARGIN-TOP: 6px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2"><b><i>The
Company</i></b></font></p>
<p style="MARGIN-TOP: 6px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">AcelRx Pharmaceuticals,
Inc., or AcelRx or the Company, is a development stage company that
was incorporated in Delaware on July 13, 2005 as SuRx, Inc. In
January 2006, the Company changed its name to AcelRx
Pharmaceuticals, Inc. The Company’s operations are based in
Redwood City, California.</font></p>
<p style="MARGIN-TOP: 12px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">The Company is a specialty
pharmaceutical company focused on the development and
commercialization of innovative therapies for the treatment of
acute and breakthrough pain. Since incorporation, primary
activities have consisted of establishing facilities, recruiting
personnel, conducting research and development of its product
candidates, developing intellectual property and raising capital.
To date, the Company has not yet commenced primary operations or
generated any significant revenues and, accordingly, the Company is
considered to be in the development stage.</font></p>
<p style="MARGIN-TOP: 12px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">The Company has one
business activity, which is the development and commercialization
of product candidates for the treatment of pain, and a single
reporting and operating unit structure.</font></p>
<p style="MARGIN-TOP: 12px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">The Company has incurred
recurring operating losses and negative cash flows from operating
activities since inception through June 30, 2013. In addition,
the Company had an accumulated deficit of $152.2 million and $122.0
million as of June 30, 2013 and December 31, 2012.
Through June 30, 2013, the Company has relied primarily on the
proceeds from equity offerings and loan proceeds to finance its
operations. Management believes that the Company’s current
cash, cash equivalents and investments, including the net proceeds
raised in the underwritten public offering completed in July 2013,
will be sufficient to fund the Company’s current operations
through at least 2014. The Company will need to raise additional
funding or otherwise enter into collaborations to fund future
operations. However, there is no assurance that additional funding
will be available to the Company on acceptable terms on a timely
basis, if at all, or that the Company will achieve profitable
operations. If the Company is unable to raise additional capital to
fund its operations, it will need to curtail planned activities to
reduce costs. Doing so may affect the Company’s ability to
operate effectively. The accompanying financial statements do not
include any adjustments that might result from the outcome of these
uncertainties.</font></p>
</div>
<div>
<p style="MARGIN-TOP: 18px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2"><b>2. Investments and Fair
Value Measurement</b></font></p>
<!-- xbrl,body -->
<p style="MARGIN-TOP: 6px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2"><b><i>Investments</i></b></font></p>
<p style="MARGIN-TOP: 6px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">The Company classifies its
marketable securities as available-for-sale and records its
investments at fair value. Available-for-sale securities are
carried at estimated fair value based on quoted market prices, with
the unrealized holding gains and losses included in accumulated
other comprehensive income. Marketable securities which have
maturities beyond one year as of the end of the reporting period
are classified as non-current.</font></p>
<p style="MARGIN-TOP: 12px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">The table below summarizes
the Company’s cash, cash equivalents and investments (in
thousands):</font></p>
<p style="MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px; FONT-SIZE: 12px">
 </p>
<table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="92%" align="center">
<!-- Begin Table Head -->
<tr>
<td width="52%"></td>
<td valign="bottom" width="8%"></td>
<td></td>
<td></td>
<td></td>
<td valign="bottom" width="8%"></td>
<td></td>
<td></td>
<td></td>
<td valign="bottom" width="8%"></td>
<td></td>
<td></td>
<td></td>
<td valign="bottom" width="4%"></td>
<td></td>
<td></td>
<td valign="bottom" width="4%"></td>
</tr>
<tr>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="14" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>As of June 30,
2013</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
</tr>
<tr>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>Amortized Cost</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>Gross Unrealized<br />
Gains</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>Gross Unrealized<br />
Losses</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>Fair<br />
Value</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
</tr>
<!-- End Table Head --><!-- Begin Table Body -->
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Cash and cash
equivalents:</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
</tr>
<tr>
<td valign="bottom">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Cash</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">21,567</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2"> —  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2"> —  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">21,567</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Money market
funds</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">51</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">51</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr>
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">U.S. government agency securities</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">301</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">301</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr style="FONT-SIZE: 1px">
<td valign="bottom"></td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Total cash and cash
equivalents</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">21,919</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">21,919</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr>
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Marketable
securities:</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">U.S. government agency securities</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">14,926</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">(1</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">) </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">14,925</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr style="FONT-SIZE: 1px">
<td valign="bottom"></td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
</tr>
<tr>
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Total marketable
securities</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">14,926</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">(1</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">) </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">14,925</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr style="FONT-SIZE: 1px">
<td valign="bottom"></td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Total cash, cash
equivalents and investments</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">36,845</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2"> —  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">(1</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">) </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">36,844</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr style="FONT-SIZE: 1px">
<td valign="bottom"></td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
</tr>
<tr>
<td height="16"></td>
<td height="16" colspan="16"></td>
</tr>
<tr>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="14" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>As of December 31,
2012</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
</tr>
<tr>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>Amortized Cost</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>Gross Unrealized<br />
Gains</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>Gross Unrealized<br />
Losses</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>Fair<br />
Value</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Cash and cash
equivalents:</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
</tr>
<tr>
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Cash</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">44,440</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2"> —  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2"> —  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">44,440</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Money market
funds</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">2,086</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">2,086</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr>
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">U.S. government agency securities</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">1,406</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">1,406</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr style="FONT-SIZE: 1px">
<td valign="bottom"></td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Total cash and cash
equivalents</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">47,932</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">47,932</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr>
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Marketable
securities:</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">U.S. government agency securities</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">11,830</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">1</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">11,831</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr style="FONT-SIZE: 1px">
<td valign="bottom"></td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
</tr>
<tr>
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Total marketable
securities</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">11,830</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">1</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">11,831</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr style="FONT-SIZE: 1px">
<td valign="bottom"></td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Total cash, cash
equivalents and investments</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">59,762</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">1</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">59,763</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<!-- End Table Body --></table>
<p style="MARGIN-TOP: 12px; MARGIN-BOTTOM: 0px; FONT-SIZE: 1px">
 </p>
<p style="MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">As of June 30, 2013
and December 31, 2012, none of the available-for-sale
securities held by the Company had material unrealized losses.
There were no other-than-temporary impairments for these securities
at June 30, 2013 or December 31, 2012. No gross realized
gains or losses were recognized on the available-for-sale
securities and, accordingly, there were no amounts reclassified out
of accumulated other comprehensive income to earnings during the
three and six months ended June 30, 2013 and 2012.</font></p>
<p style="MARGIN-TOP: 12px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">As of June 30, 2013,
$3.0 million of our investments had contractual maturities between
1 and 2 years. As of December 31, 2012, the contractual
maturity of all investments held was less than one year.</font></p>
<p style="MARGIN-TOP: 18px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2"><b><i>Fair Value
Measurement</i></b></font></p>
<p style="MARGIN-TOP: 6px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">The Company’s
financial instruments consist of Level I and Level II assets and
Level III liabilities. Level I securities include highly liquid
money market funds and are valued based on quoted market prices.
For Level II instruments, the Company estimates fair value by
utilizing third party pricing services in developing fair value
measurements where fair value is based on valuation methodologies
such as models using observable market inputs, including benchmark
yields, reported trades, broker/dealer quotes, bids, offers and
other reference data. Such Level II instruments typically include
U.S. treasury and U.S. government agency obligations. As of
June 30, 2013 and December 31, 2012, the Company held, in
addition to Level I and Level II assets, a contingent put option
liability associated with the Company’s loan and security
agreement with Hercules Technology II, L.P. and Hercules Technology
Growth Capital, Inc., collectively referred to as Hercules, which
was classified as a Level III liability. The value of this
liability was determined by using a risk-neutral valuation model,
wherein the fair value of the underlying debt facility is estimated
both with and without the presence of the default provisions,
holding all other assumptions constant. The resulting difference
between the two estimated fair values is the estimated fair value
of the default provisions, or the contingent put option. The fair
value of the underlying debt facility is estimated by calculating
the expected cash flows in consideration of an estimated
probability of default and expected recovery rate in default, and
discounting such cash flows back to the reporting date using a
risk-free rate. As of June 30, 2013 and December 31,
2012, the Company also held a Level III liability associated with
warrants, or PIPE warrants, issued in connection with the
Company’s private placement equity offering, completed in
June 2012. The PIPE warrants are considered a liability and are
valued using the Black-Scholes option-pricing model, the inputs for
which include exercise price of the PIPE warrants, market price of
the underlying common shares, expected term, volatility based on a
group of the Company’s peers and the risk-free rate
corresponding to the expected term of the PIPE warrants. Changes to
any of the inputs can have a significant impact to the estimated
fair value of the PIPE warrants.</font></p>
<p style="MARGIN-TOP: 12px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">The following table sets
forth the fair value of the Company’s financial assets and
liabilities by level within the fair value hierarchy (in
thousands):</font></p>
<p style="MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px; FONT-SIZE: 12px">
 </p>
<table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="92%" align="center">
<!-- Begin Table Head -->
<tr>
<td width="66%"></td>
<td valign="bottom" width="4%"></td>
<td></td>
<td></td>
<td></td>
<td valign="bottom" width="4%"></td>
<td></td>
<td></td>
<td></td>
<td valign="bottom" width="4%"></td>
<td></td>
<td></td>
<td></td>
<td valign="bottom" width="2%"></td>
<td></td>
<td></td>
<td valign="bottom" width="2%"></td>
</tr>
<tr>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="14" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>As of June 30,
2013</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
</tr>
<tr>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>Fair Value</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>Level I</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>Level II</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>Level III</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
</tr>
<!-- End Table Head --><!-- Begin Table Body -->
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2"><b><u>Assets</u></b></font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
</tr>
<tr>
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Money market
funds</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">51</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">51</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">U.S. government agency
obligations</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">15,226</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">15,226</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr style="FONT-SIZE: 1px">
<td valign="bottom"></td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
</tr>
<tr>
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Total assets measured at
fair value</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">15,277</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">51</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">15,226</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr style="FONT-SIZE: 1px">
<td valign="bottom"></td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2"><b><u>Liabilities</u></b></font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
</tr>
<tr>
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">PIPE warrant</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">17,850</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">17,850</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Contingent put option
liability</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">39</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">39</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr style="FONT-SIZE: 1px">
<td valign="bottom"></td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
</tr>
<tr>
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Total liabilities measured
at fair value</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">17,889</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">17,889</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr style="FONT-SIZE: 1px">
<td valign="bottom"></td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
</tr>
<!-- End Table Body --></table>
<p style="MARGIN-TOP: 12px; MARGIN-BOTTOM: 0px; FONT-SIZE: 1px">
 </p>
<table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="92%" align="center">
<!-- Begin Table Head -->
<tr>
<td width="66%"></td>
<td valign="bottom" width="4%"></td>
<td></td>
<td></td>
<td></td>
<td valign="bottom" width="4%"></td>
<td></td>
<td></td>
<td></td>
<td valign="bottom" width="4%"></td>
<td></td>
<td></td>
<td></td>
<td valign="bottom" width="4%"></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="14" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>As of December 31,
2012</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
</tr>
<tr>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>Fair Value</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>Level I</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>Level II</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>Level III</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
</tr>
<!-- End Table Head --><!-- Begin Table Body -->
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2"><b><u>Assets</u></b></font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
</tr>
<tr>
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Money market
funds</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">2,086</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">2,086</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">U.S. government agency
obligations</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">13,237</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">13,237</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr style="FONT-SIZE: 1px">
<td valign="bottom"></td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
</tr>
<tr>
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Total assets measured at
fair value</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">15,323</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">2,086</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">13,237</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr style="FONT-SIZE: 1px">
<td valign="bottom"></td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2"><u><b>Liabilities</b></u></font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
<td valign="bottom"></td>
</tr>
<tr>
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">PIPE warrant</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">7,418</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">7,418</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Contingent put option
liability</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">82</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">82</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr style="FONT-SIZE: 1px">
<td valign="bottom"></td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
</tr>
<tr>
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Total liabilities measured
at fair value</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">7,500</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">7,500</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr style="FONT-SIZE: 1px">
<td valign="bottom"></td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
</tr>
<!-- End Table Body --></table>
<p style="MARGIN-TOP: 12px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">The following table sets
forth the assumptions used in the Black-Scholes option-pricing
model to estimate the fair value of the PIPE warrants as of
June 30, 2013:</font></p>
<p style="MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px; FONT-SIZE: 12px">
 </p>
<table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="68%" align="center">
<!-- Begin Table Head -->
<tr>
<td width="92%"></td>
<td valign="bottom" width="6%"></td>
<td></td>
<td></td>
<td></td>
</tr>
<!-- End Table Head --><!-- Begin Table Body -->
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Risk-free interest
rate</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">1.41</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">% </font></td>
</tr>
<tr>
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Expected
volatility</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">71.0</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">% </font></td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Expected life (in
years)</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">4.4</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr>
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Expected dividend
yield</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">0.0</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">% </font></td>
</tr>
<!-- End Table Body --></table>
<p style="MARGIN-TOP: 12px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">The following table sets
forth the assumptions used in the Black-Scholes option-pricing
model to estimate the fair value of the PIPE warrants as of
December 31, 2012:</font></p>
<p style="MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px; FONT-SIZE: 12px">
 </p>
<table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="68%" align="center">
<!-- Begin Table Head -->
<tr>
<td width="92%"></td>
<td valign="bottom" width="6%"></td>
<td></td>
<td></td>
<td></td>
</tr>
<!-- End Table Head --><!-- Begin Table Body -->
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Risk-free interest
rate</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">0.72</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">% </font></td>
</tr>
<tr>
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Expected
volatility</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">78.0</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">% </font></td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Expected life (in
years)</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">4.9</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr>
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Expected dividend
yield</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">0.0</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">% </font></td>
</tr>
<!-- End Table Body --></table>
<p style="MARGIN-TOP: 12px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">The following tables set
forth a summary of the changes in the fair value of the
Company’s Level III financial liabilities for the three and
six months ended June 30, 2013 and June 30, 2012 (in
thousands):</font></p>
<p style="MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px; FONT-SIZE: 12px">
 </p>
<table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="76%" align="center">
<!-- Begin Table Head -->
<tr>
<td width="74%"></td>
<td valign="bottom" width="8%"></td>
<td></td>
<td></td>
<td></td>
<td valign="bottom" width="8%"></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>Three Months<br />
Ended<br />
June 30,<br />
2013</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>Six Months<br />
Ended<br />
June 30,<br />
2013</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
</tr>
<!-- End Table Head --><!-- Begin Table Body -->
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Fair value—beginning
of period</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">9,254</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">7,500</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr>
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Change in fair value of
Level III liabilities</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">8,635</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">10,389</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr style="FONT-SIZE: 1px">
<td valign="bottom"></td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Fair value—end of
period</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">17,889</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">17,889</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr style="FONT-SIZE: 1px">
<td valign="bottom"></td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
</tr>
<tr>
<td height="16"></td>
<td height="16" colspan="4"></td>
<td height="16" colspan="4"></td>
</tr>
<tr>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>Three Months<br />
Ended<br />
June 30,<br />
2012</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>Six Months<br />
Ended<br />
June 30,<br />
2012</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Fair value—beginning
of period</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">171</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">232</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr>
<td valign="top" nowrap="nowrap">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Addition of private
placement warrant liability on June 1, 2012</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">5,828</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">5,828</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Change in fair value of
Level III liabilities</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">(376</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">) </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">(437</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">) </font></td>
</tr>
<tr style="FONT-SIZE: 1px">
<td valign="bottom"></td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
</tr>
<tr>
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Fair value—end of
period</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">5,623</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">5,623</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr style="FONT-SIZE: 1px">
<td valign="bottom"></td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
</tr>
<!-- End Table Body --></table>
<p style="MARGIN-TOP: 18px; MARGIN-BOTTOM: 0px; FONT-SIZE: 1px">
 </p>
<!-- xbrl,n --></div>
P7Y
11003000
P2Y
<div>
<p style="MARGIN-TOP: 12px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">The following table sets
forth the assumptions used in the Black-Scholes option-pricing
model to estimate the fair value of the PIPE warrants as of
June 30, 2013:</font></p>
<p style="MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px; FONT-SIZE: 12px">
 </p>
<table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="68%" align="center">
<tr>
<td width="92%"></td>
<td valign="bottom" width="6%"></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Risk-free interest
rate</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">1.41</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">% </font></td>
</tr>
<tr>
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Expected
volatility</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">71.0</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">% </font></td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Expected life (in
years)</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">4.4</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr>
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Expected dividend
yield</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">0.0</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">% </font></td>
</tr>
</table>
<p style="MARGIN-TOP: 12px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">The following table sets
forth the assumptions used in the Black-Scholes option-pricing
model to estimate the fair value of the PIPE warrants as of
December 31, 2012:</font></p>
<p style="MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px; FONT-SIZE: 12px">
 </p>
<table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="68%" align="center">
<tr>
<td width="92%"></td>
<td valign="bottom" width="6%"></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Risk-free interest
rate</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">0.72</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">% </font></td>
</tr>
<tr>
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Expected
volatility</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">78.0</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">% </font></td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Expected life (in
years)</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">4.9</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr>
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Expected dividend
yield</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">0.0</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">% </font></td>
</tr>
</table>
</div>
P18M
0
0.80
Beyond one year
<div>
<p style="MARGIN-TOP: 18px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2"><b>5.
Warrants</b></font></p>
<!-- xbrl,body -->
<p style="MARGIN-TOP: 6px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2"><b><i>2012 Private
Placement Warrants</i></b></font></p>
<p style="MARGIN-TOP: 6px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">In connection with the
Private Placement, completed in June 2012, the Company issued PIPE
warrants to purchase up to 2,630,103 shares of common stock. The
per share exercise price of the PIPE warrants was $3.40 which
equals the closing consolidated bid price of the Company’s
common stock on May 29, 2012, the effective date of the
Purchase Agreement. The PIPE warrants issued in the Private
Placement became exercisable six months after the issuance date,
and expire on the five year anniversary of the initial
exercisability date. Under the terms of the PIPE warrants, upon
certain transactions, including a merger, tender offer, sale of all
or substantially all of the assets of the Company or if a person or
group shall become the owner of 50% of the Company’s issued
and outstanding common stock, which is outside of the
Company’s control, each PIPE warrant holder may elect to
receive a cash payment in exchange for the warrant, in an amount
determined by application of the Black-Scholes option-pricing
model. Accordingly, the PIPE warrants were recorded as a liability
at fair value, as determined by the Black-Scholes option-pricing
model, and then marked to fair value each reporting period, with
changes in estimated fair value recorded through the Statement of
Comprehensive Loss in other income or expense. The Black-Scholes
assumptions used to value the PIPE warrants are disclosed in Note
2.</font></p>
<p style="MARGIN-TOP: 12px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">Upon execution of the
Purchase Agreement, the fair value of the PIPE warrants was
estimated to be $5.8 million, which was recorded as a liability. As
of June 30, 2013, the fair value of the PIPE warrants was
estimated to be $17.9 million. As of December 31, 2012, the
fair value of the PIPE warrants was estimated to be $7.4 million.
The change in fair value for the three months and six months ended
June 30, 2013, which was recorded as other expense, was $8.7
million and $10.4 million, respectively. The change in fair value
for the three months and six months ended June 30, 2012, which
was recorded as other income, was $0.4 million for both
periods.</font></p>
<p style="MARGIN-TOP: 12px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">During the three and six
months ended June 30, 2013, warrants to purchase 96,280 shares
were net exercised for 60,853 shares of common stock. As of
June 30, 2013, PIPE warrants to purchase 2,533,823 shares of
common stock issued in connection with the Private Placement had
not been exercised and were outstanding. These warrants expire in
November 2017.</font></p>
<p style="MARGIN-TOP: 18px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2"><b><i>Hercules
Warrants</i></b></font></p>
<p style="MARGIN-TOP: 6px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">In connection with the loan
and security agreement with Hercules, the Company issued to
Hercules warrants to purchase an aggregate of 274,508 shares of
common stock at a price of $3.06 per share. The warrants may be
exercised on a cashless basis. The warrants are exercisable for a
term beginning on the date of issuance and ending on the earlier to
occur of seven years from the date of issuance or the consummation
of certain acquisitions of the Company as set forth in the
warrants. The Company estimated the fair value of these warrants as
of the issuance date to be $967,000, which was recorded as a debt
discount to the loan and consequently a reduction to the carrying
value of the loan. The fair value of the warrants was calculated
using the Black-Scholes option valuation model. The Company also
recorded fees paid to Hercules as a debt discount, which further
reduced the carrying value of the loan. The debt discount is being
amortized to interest expense.</font></p>
<p style="MARGIN-TOP: 12px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">During the three and six
months ended June 30, 2013, warrants to purchase 137,254
shares were net exercised, for 89,243 shares of common stock. As of
June 30, 2013, warrants to purchase 137,254 shares of common
stock issued to Hercules had not been exercised and were
outstanding.</font></p>
<p style="MARGIN-TOP: 18px; MARGIN-BOTTOM: 0px; FONT-SIZE: 1px">
 </p>
<p style="MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2"><b><i>Series B and Series C
Warrants</i></b></font></p>
<p style="MARGIN-TOP: 6px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">In September 2008, the
Company entered into a $12.0 million loan and security agreement
with Pinnacle Ventures. In connection with the Company’s IPO
in February 2011, the warrants issued in connection with the loan
and security agreement were automatically converted into warrants
to purchase 228,264 shares of common stock with an exercise price
of $3.94 per share.</font></p>
<p style="MARGIN-TOP: 12px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">During the quarter ended
March 31, 2013, warrants to purchase 228,264 shares, were net
exercised by Pinnacle Ventures for 58,580 shares of common stock.
No warrants were outstanding as of June 30, 2013.</font></p>
</div>
793000
766000
5045417
65765
2674502
0.01
P1Y
0.03
P2Y
0.710
0.000
0.0141
P4Y4M24D
10400000
Under the terms of the PIPE warrants, upon certain transactions, including a merger, tender offer, sale of all or substantially all of the assets of the Company or if a person or group shall become the owner of 50% of the Company's issued and outstanding common stock, which is outside of the Company's control, each PIPE warrant holder may elect to receive a cash payment in exchange for the warrant, in an amount determined by application of the Black-Scholes option-pricing model.
60853
96280
P6M
P5Y
3.06
274508
89243
137254
P7Y
2014-12-01
Subject to certain conditions and limitations set forth in the Hercules loan and security agreement, the Company has the right to convert up to $3.0 million of scheduled principal installments under the notes into that number of freely tradable shares of common stock equal to (x) the product of (A) the principal amount to be so converted and (B) 103%, divided by (y) $5.73 per share.
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The condensed balance sheet as of December 31, 2012 has been derived from the audited financial statements as of that date included in the Company's Annual Report on Form 10-K for the year ended December 31, 2012.