10000000
20000000
2
5623000
2630103
17889000
11.65
3721000
5454000
43039269
100000000
0.001
43039269
12423000
8134000
12428000
4000
2385000
216380000
1248000
53205000
12391000
-163222000
3046000
27456000
220000
43000
80661000
75964000
250000
3412000
80661000
15300000
60795000
15173000
75968000
1031000
76999000
3500000
32000
4000
0
60795000
60795000
27000
27000
60668000
60668000
100000
100000
15169000
15173000
4000
15169000
15173000
4000
3000000
27000
27000
15273000
15273000
32000
32000
65765
470189
4923633
270373
12000000
0
10500000
200000
32000
27000
15273000
12423000
12423000
12391000
1494514
12391000
12400000
2017-11-01
5800000
0
967000
43039269
7794000
10000000
0.0850
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
1000
0
47932000
47932000
2086000
2086000
44440000
44440000
1406000
1406000
11830000
11831000
1000
11830000
11831000
1000
2086000
2086000
13237000
13237000
82000
82000
16000000
500000
82000
2086000
13237000
7500000
7500000
7418000
7418000
7400000
4370000
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47900000
ACRX
ACELRX PHARMACEUTICALS INC
false
Smaller Reporting Company
2013
10-Q
2013-09-30
0001427925
--12-31
Q3
<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="font-size:12px;margin-top:0px;margin-bottom:0px">
 </p>
<p style="font-size:12px;margin-top:0px;margin-bottom:0px">
 </p>
<table cellspacing="0" cellpadding="0" width="76%" border="0" style="BORDER-COLLAPSE:COLLAPSE" 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 valign="bottom" colspan="6" align="center" style="border-bottom:1px solid #000000"><font style="font-family:Times New Roman" size="1"><b>September 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 valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000"><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 valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000"><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="margin-left:1.00em; text-indent:-1.00em"><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">4,923,633</font></td>
<td nowrap="nowrap" valign="bottom"><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">3,321,038</font></td>
<td nowrap="nowrap" valign="bottom"><font style="font-family:Times New Roman" size="2">  </font></td>
</tr>
<tr>
<td valign="top">
<p style="margin-left:1.00em; text-indent:-1.00em"><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 nowrap="nowrap" valign="bottom"><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">161,096</font></td>
<td nowrap="nowrap" valign="bottom"><font style="font-family:Times New Roman" size="2">  </font></td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="margin-left:1.00em; text-indent:-1.00em"><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">1,497,939</font></td>
<td nowrap="nowrap" valign="bottom"><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 nowrap="nowrap" valign="bottom"><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
nine months ended September 30, 2013 and September 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">
<tr>
<td width="72%"></td>
<td valign="bottom" width="9%"></td>
<td></td>
<td></td>
<td></td>
<td valign="bottom" width="9%"></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 />
September 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>Nine Months<br />
Ended<br />
September 30,<br />
2013</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">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">17,889</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">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">(5,466</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">4,923</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">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">12,423</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">12,423</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 />
September 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>Nine Months<br />
Ended<br />
September 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">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">5,623</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">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">—  </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">(169</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">(606</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">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">5,454</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">5,454</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>
</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 September 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">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">27</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">27</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">15,273</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">15,273</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">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">15,300</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">27</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">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">15,273</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</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 warrants</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">12,391</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">12,391</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">32</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">32</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">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">12,423</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</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">12,423</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>
<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="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 warrants</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">7,418</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</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>
38635370
<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 nine months
ended September 30, 2013 and 2012 (in thousands, except for
share and per share amounts):</font></p>
<p style="font-size:12px;margin-top:0px;margin-bottom:0px">
 </p>
<table cellspacing="0" cellpadding="0" width="92%" border="0" style="BORDER-COLLAPSE:COLLAPSE" align="center">
<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 valign="bottom" colspan="6" align="center" style="border-bottom:1px solid #000000"><font style="font-family:Times New Roman" size="1"><b>Three Months Ended<br />
September 30,</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom" colspan="6" align="center" style="border-bottom:1px solid #000000"><font style="font-family:Times New Roman" size="1"><b>Nine Months Ended<br />
September 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 valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000"><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 valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000"><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 valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000"><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 valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000"><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="margin-left:1.00em; text-indent:-1.00em"><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">$</font></td>
<td valign="bottom" align="right"><font style="font-family:Times New Roman" size="2">(10,986</font></td>
<td nowrap="nowrap" valign="bottom"><font style="font-family:Times New Roman" size="2">) </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="font-family:Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="font-family:Times New Roman" size="2">(8,582</font></td>
<td nowrap="nowrap" valign="bottom"><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">$</font></td>
<td valign="bottom" align="right"><font style="font-family:Times New Roman" size="2">(41,195</font></td>
<td nowrap="nowrap" valign="bottom"><font style="font-family:Times New Roman" size="2">) </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="font-family:Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="font-family:Times New Roman" size="2">(22,841</font></td>
<td nowrap="nowrap" valign="bottom"><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:3px double #000000"> </p>
</td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td> </td>
</tr>
<tr>
<td valign="top">
<p style="margin-left:1.00em; text-indent:-1.00em"><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">41,462,425</font></td>
<td nowrap="nowrap" valign="bottom"><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">22,632,573</font></td>
<td nowrap="nowrap" valign="bottom"><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">38,635,370</font></td>
<td nowrap="nowrap" valign="bottom"><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">20,961,886</font></td>
<td nowrap="nowrap" valign="bottom"><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:3px double #000000"> </p>
</td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td> </td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="margin-left:1.00em; text-indent:-1.00em"><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">$</font></td>
<td valign="bottom" align="right"><font style="font-family:Times New Roman" size="2">(0.26</font></td>
<td nowrap="nowrap" valign="bottom"><font style="font-family:Times New Roman" size="2">) </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="font-family:Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="font-family:Times New Roman" size="2">(0.38</font></td>
<td nowrap="nowrap" valign="bottom"><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">$</font></td>
<td valign="bottom" align="right"><font style="font-family:Times New Roman" size="2">(1.07</font></td>
<td nowrap="nowrap" valign="bottom"><font style="font-family:Times New Roman" size="2">) </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="font-family:Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="font-family:Times New Roman" size="2">(1.09</font></td>
<td nowrap="nowrap" valign="bottom"><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:3px double #000000"> </p>
</td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </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>6. Stockholders’
Equity</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, at a price of $11.65 per share to the
public. The total gross proceeds of this offering were $50.9
million with net proceeds to AcelRx of $47.9 million after
deducting underwriting discounts and commissions and other 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>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 September 30, 2013
and December 31, 2012, the estimated fair value of the
contingent put option liability was $32,000 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 is revalued at the end of each reporting period
and any change in the fair value is 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="font-size:1px;margin-top:12px;margin-bottom:0px">
 </p>
<p style="margin-top:0px;margin-bottom:0px"><font style="font-family:Times New Roman" size="2">As of September 30,
2013, the Company had outstanding borrowings under the Hercules
loan and security agreement of $10.5 million, net of debt discounts
of $0.2 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 was recorded as interest expense, was $85,000 and
$134,000 for the three months ended September 30, 2013 and
2012, respectively, and $290,000 and $406,000 for the nine months
ended September 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="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 September 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>
<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">60,668</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">60,668</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">27</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">27</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">100</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">100</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">60,795</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">60,795</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">15,169</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</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">15,173</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">15,169</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</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">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">15,173</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr style="FONT-SIZE: 1px">
<td valign="bottom"></td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Total cash, cash
equivalents and investments</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">75,964</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">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">4</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</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">75,968</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>
</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 September 30, 2013. In
addition, the Company had an accumulated deficit of $163.2 million
and $122.0 million as of September 30, 2013 and
December 31, 2012, respectively. Through September 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. After that, 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 style="FONT-FAMILY: Times New Roman" size="2">Operating results for the
three and nine months ended September 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-SIZE: 1px">
 </p>
<p style="MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2"><b><i>New 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. This
adoption did not have a material effect on the Company’s
condensed consolidated financial statements.</font></p>
<p style="MARGIN-TOP: 12px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">The Financial Accounting
Standards Board issued Accounting Standards Update (ASU) 2013.11,
“Presentation of an Unrecognized Tax Benefit When a Net
Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit
Carryforward Exists” on July 18, 2013. The ASU concludes
an unrecognized tax benefit should be presented as a reduction of a
deferred tax asset when settlement in this manner is available
under the law. We will adopt this amendment as of January 2014. The
result of adoption may be to reclassify certain long term
liabilities to long term deferred tax assets, and the adoption will
not result in a change to the tax provision. Management does not
believe that the impact on the balance sheet will be
significant.</font></p>
</div>
-25935000
<div>
<p style="margin-top:18px;margin-bottom:0px"><font style="font-family:Times New Roman" size="2"><b>8. Net Loss per Share of
Common Stock</b></font></p>
<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 nine months
ended September 30, 2013 and 2012 (in thousands, except for
share and per share amounts):</font></p>
<p style="font-size:12px;margin-top:0px;margin-bottom:0px">
 </p>
<table cellspacing="0" cellpadding="0" width="92%" border="0" style="BORDER-COLLAPSE:COLLAPSE" align="center">
<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 valign="bottom" colspan="6" align="center" style="border-bottom:1px solid #000000"><font style="font-family:Times New Roman" size="1"><b>Three Months Ended<br />
September 30,</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom" colspan="6" align="center" style="border-bottom:1px solid #000000"><font style="font-family:Times New Roman" size="1"><b>Nine Months Ended<br />
September 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 valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000"><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 valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000"><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 valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000"><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 valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000"><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="margin-left:1.00em; text-indent:-1.00em"><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">(10,986</font></td>
<td nowrap="nowrap" valign="bottom"><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">$</font></td>
<td valign="bottom" align="right"><font style="font-family:Times New Roman" size="2">(8,582</font></td>
<td nowrap="nowrap" valign="bottom"><font style="font-family:Times New Roman" size="2">) </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="font-family:Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="font-family:Times New Roman" size="2">(41,195</font></td>
<td nowrap="nowrap" valign="bottom"><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">(22,841</font></td>
<td nowrap="nowrap" valign="bottom"><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:3px double #000000"> </p>
</td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td> </td>
</tr>
<tr>
<td valign="top">
<p style="margin-left:1.00em; text-indent:-1.00em"><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">41,462,425</font></td>
<td nowrap="nowrap" valign="bottom"><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">22,632,573</font></td>
<td nowrap="nowrap" valign="bottom"><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">38,635,370</font></td>
<td nowrap="nowrap" valign="bottom"><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">20,961,886</font></td>
<td nowrap="nowrap" valign="bottom"><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:3px double #000000"> </p>
</td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td> </td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="margin-left:1.00em; text-indent:-1.00em"><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">(0.26</font></td>
<td nowrap="nowrap" valign="bottom"><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">$</font></td>
<td valign="bottom" align="right"><font style="font-family:Times New Roman" size="2">(0.38</font></td>
<td nowrap="nowrap" valign="bottom"><font style="font-family:Times New Roman" size="2">) </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="font-family:Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="font-family:Times New Roman" size="2">(1.07</font></td>
<td nowrap="nowrap" valign="bottom"><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">(1.09</font></td>
<td nowrap="nowrap" valign="bottom"><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:3px double #000000"> </p>
</td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td> </td>
</tr>
</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="font-size:12px;margin-top:0px;margin-bottom:0px">
 </p>
<p style="font-size:12px;margin-top:0px;margin-bottom:0px">
 </p>
<table cellspacing="0" cellpadding="0" width="76%" border="0" style="BORDER-COLLAPSE:COLLAPSE" 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 valign="bottom" colspan="6" align="center" style="border-bottom:1px solid #000000"><font style="font-family:Times New Roman" size="1"><b>September 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 valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000"><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 valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000"><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="margin-left:1.00em; text-indent:-1.00em"><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">4,923,633</font></td>
<td nowrap="nowrap" valign="bottom"><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">3,321,038</font></td>
<td nowrap="nowrap" valign="bottom"><font style="font-family:Times New Roman" size="2">  </font></td>
</tr>
<tr>
<td valign="top">
<p style="margin-left:1.00em; text-indent:-1.00em"><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 nowrap="nowrap" valign="bottom"><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">161,096</font></td>
<td nowrap="nowrap" valign="bottom"><font style="font-family:Times New Roman" size="2">  </font></td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="margin-left:1.00em; text-indent:-1.00em"><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">1,497,939</font></td>
<td nowrap="nowrap" valign="bottom"><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 nowrap="nowrap" valign="bottom"><font style="font-family:Times New Roman" size="2">  </font></td>
</tr>
</table>
</div>
<div>
<p style="margin-top:0px;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 a 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 $0.5 million and $0.2 million for the three
months ended September 30, 2013 and 2012, respectively, and
$1.9 million and $0.7 million for the nine months ended
September 30, 2013 and 2012, respectively. From inception of
the grant through September 30, 2013, AcelRx has generated
grant revenue of $5.4 million.</font></p>
</div>
<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="font-size:12px;margin-top:0px;margin-bottom:0px">
 </p>
<table cellspacing="0" cellpadding="0" width="100%" border="0" style="BORDER-COLLAPSE:COLLAPSE" 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 valign="bottom" colspan="6" align="center" style="border-bottom:1px solid #000000"><font style="font-family:Times New Roman" size="1"><b>Three Months Ended<br />
September 30,</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom" colspan="6" align="center" style="border-bottom:1px solid #000000"><font style="font-family:Times New Roman" size="1"><b>Nine Months Ended<br />
September 30,</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom" colspan="2" rowspan="2" align="center" style="border-bottom:1px solid #000000"><font style="font-family:Times New Roman" size="1"><b>Period from July 13,<br />
2005 (Inception)<br />
Through September 30,<br />
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 valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000"><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 valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000"><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 valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000"><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 valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000"><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="margin-left:1.00em; text-indent:-1.00em"><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="margin-left:3.00em; text-indent:-1.00em"><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">427</font></td>
<td nowrap="nowrap" valign="bottom"><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">$</font></td>
<td valign="bottom" align="right"><font style="font-family:Times New Roman" size="2">258</font></td>
<td nowrap="nowrap" valign="bottom"><font style="font-family:Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="font-family:Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="font-family:Times New Roman" size="2">1,193</font></td>
<td nowrap="nowrap" valign="bottom"><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">$</font></td>
<td valign="bottom" align="right"><font style="font-family:Times New Roman" size="2">762</font></td>
<td nowrap="nowrap" valign="bottom"><font style="font-family:Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="font-family:Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="font-family:Times New Roman" size="2">4,570</font></td>
<td nowrap="nowrap" valign="bottom"><font style="font-family:Times New Roman" size="2">  </font></td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="margin-left:3.00em; text-indent:-1.00em"><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">449</font></td>
<td nowrap="nowrap" valign="bottom"><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">304</font></td>
<td nowrap="nowrap" valign="bottom"><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">1,242</font></td>
<td nowrap="nowrap" valign="bottom"><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">871</font></td>
<td nowrap="nowrap" valign="bottom"><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">4,361</font></td>
<td nowrap="nowrap" valign="bottom"><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:1px solid #000000"> </p>
</td>
<td valign="bottom">
<p style="border-top:1px solid #000000"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="border-top:1px solid #000000"> </p>
</td>
<td valign="bottom">
<p style="border-top:1px solid #000000"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="border-top:1px solid #000000"> </p>
</td>
<td valign="bottom">
<p style="border-top:1px solid #000000"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="border-top:1px solid #000000"> </p>
</td>
<td valign="bottom">
<p style="border-top:1px solid #000000"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="border-top:1px solid #000000"> </p>
</td>
<td valign="bottom">
<p style="border-top:1px solid #000000"> </p>
</td>
<td> </td>
</tr>
<tr>
<td valign="top">
<p style="margin-left:5.00em; text-indent:-1.00em"><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">$</font></td>
<td valign="bottom" align="right"><font style="font-family:Times New Roman" size="2">876</font></td>
<td nowrap="nowrap" valign="bottom"><font style="font-family:Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="font-family:Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="font-family:Times New Roman" size="2">562</font></td>
<td nowrap="nowrap" valign="bottom"><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">$</font></td>
<td valign="bottom" align="right"><font style="font-family:Times New Roman" size="2">2,435</font></td>
<td nowrap="nowrap" valign="bottom"><font style="font-family:Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="font-family:Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="font-family:Times New Roman" size="2">1,633</font></td>
<td nowrap="nowrap" valign="bottom"><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">8,931</font></td>
<td nowrap="nowrap" valign="bottom"><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:3px double #000000"> </p>
</td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </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>
-1.07
<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 style="FONT-FAMILY: Times New Roman" size="2">Operating results for the
three and nine months ended September 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>7. 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="font-size:12px;margin-top:0px;margin-bottom:0px">
 </p>
<table cellspacing="0" cellpadding="0" width="100%" border="0" style="BORDER-COLLAPSE:COLLAPSE" 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 valign="bottom" colspan="6" align="center" style="border-bottom:1px solid #000000"><font style="font-family:Times New Roman" size="1"><b>Three Months Ended<br />
September 30,</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom" colspan="6" align="center" style="border-bottom:1px solid #000000"><font style="font-family:Times New Roman" size="1"><b>Nine Months Ended<br />
September 30,</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom" colspan="2" rowspan="2" align="center" style="border-bottom:1px solid #000000"><font style="font-family:Times New Roman" size="1"><b>Period from July 13,<br />
2005 (Inception)<br />
Through September 30,<br />
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 valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000"><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 valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000"><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 valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000"><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 valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000"><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="margin-left:1.00em; text-indent:-1.00em"><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="margin-left:3.00em; text-indent:-1.00em"><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">427</font></td>
<td nowrap="nowrap" valign="bottom"><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">$</font></td>
<td valign="bottom" align="right"><font style="font-family:Times New Roman" size="2">258</font></td>
<td nowrap="nowrap" valign="bottom"><font style="font-family:Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="font-family:Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="font-family:Times New Roman" size="2">1,193</font></td>
<td nowrap="nowrap" valign="bottom"><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">$</font></td>
<td valign="bottom" align="right"><font style="font-family:Times New Roman" size="2">762</font></td>
<td nowrap="nowrap" valign="bottom"><font style="font-family:Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="font-family:Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="font-family:Times New Roman" size="2">4,570</font></td>
<td nowrap="nowrap" valign="bottom"><font style="font-family:Times New Roman" size="2">  </font></td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="margin-left:3.00em; text-indent:-1.00em"><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">449</font></td>
<td nowrap="nowrap" valign="bottom"><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">304</font></td>
<td nowrap="nowrap" valign="bottom"><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">1,242</font></td>
<td nowrap="nowrap" valign="bottom"><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">871</font></td>
<td nowrap="nowrap" valign="bottom"><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">4,361</font></td>
<td nowrap="nowrap" valign="bottom"><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:1px solid #000000"> </p>
</td>
<td valign="bottom">
<p style="border-top:1px solid #000000"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="border-top:1px solid #000000"> </p>
</td>
<td valign="bottom">
<p style="border-top:1px solid #000000"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="border-top:1px solid #000000"> </p>
</td>
<td valign="bottom">
<p style="border-top:1px solid #000000"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="border-top:1px solid #000000"> </p>
</td>
<td valign="bottom">
<p style="border-top:1px solid #000000"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="border-top:1px solid #000000"> </p>
</td>
<td valign="bottom">
<p style="border-top:1px solid #000000"> </p>
</td>
<td> </td>
</tr>
<tr>
<td valign="top">
<p style="margin-left:5.00em; text-indent:-1.00em"><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">$</font></td>
<td valign="bottom" align="right"><font style="font-family:Times New Roman" size="2">876</font></td>
<td nowrap="nowrap" valign="bottom"><font style="font-family:Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="font-family:Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="font-family:Times New Roman" size="2">562</font></td>
<td nowrap="nowrap" valign="bottom"><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">$</font></td>
<td valign="bottom" align="right"><font style="font-family:Times New Roman" size="2">2,435</font></td>
<td nowrap="nowrap" valign="bottom"><font style="font-family:Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="font-family:Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="font-family:Times New Roman" size="2">1,633</font></td>
<td nowrap="nowrap" valign="bottom"><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">8,931</font></td>
<td nowrap="nowrap" valign="bottom"><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:3px double #000000"> </p>
</td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </p>
</td>
<td valign="bottom">
<p style="border-top:3px double #000000"> </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 September 30,
2013 there were 270,373 shares available for grant, 4,923,633
options outstanding and 65,765 restricted stock units outstanding
under the Company’s 2011 Equity Incentive Plan. In addition,
there were 470,189 shares available for grant under the
Company’s 2011 Employee Stock Purchase Plan.</font></p>
</div>
<div>
<p style="MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2"><b><i>New 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. This
adoption did not have a material effect on the Company’s
condensed consolidated financial statements.</font></p>
<p style="MARGIN-TOP: 12px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2">The Financial Accounting
Standards Board issued Accounting Standards Update (ASU) 2013.11,
“Presentation of an Unrecognized Tax Benefit When a Net
Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit
Carryforward Exists” on July 18, 2013. The ASU concludes
an unrecognized tax benefit should be presented as a reduction of a
deferred tax asset when settlement in this manner is available
under the law. We will adopt this amendment as of January 2014. The
result of adoption may be to reclassify certain long term
liabilities to long term deferred tax assets, and the adoption will
not result in a change to the tax provision. Management does not
believe that the impact on the balance sheet will be
significant.</font></p>
</div>
1366000
3000
-26650000
5789000
25704000
-1012000
0
-41192000
1895000
45000
-13340000
-41195000
-134000
-84000
6571000
43636000
2435000
12863000
359000
28545000
-1615000
1205000
-987000
1481000
0
439000
22232000
-4838000
200000
21974000
0
480000
<div>
<p style="margin-top:0px;margin-bottom:0px"><font style="font-family:Times New Roman" size="2"><b>9. Manufacturing
Agreement</b></font></p>
<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 product candidate, Zalviso, formerly known as the
Sufentanil NanoTab PCA System.</font></p>
<p style="margin-top:12px;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 September 30, 2013. In
addition, the Company had an accumulated deficit of $163.2 million
and $122.0 million as of September 30, 2013 and
December 31, 2012, respectively. Through September 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. After that, 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>
47944000
<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>
<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">
<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 September 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>
<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">60,668</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">60,668</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">27</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">27</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">100</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">100</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">60,795</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">60,795</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">15,169</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</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">15,173</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">15,169</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</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">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">15,173</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr style="FONT-SIZE: 1px">
<td valign="bottom"></td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Total cash, cash
equivalents and investments</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">75,964</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">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">4</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</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">75,968</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>
</table>
<p style="MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px; FONT-SIZE: 18px">
<font size="1"> </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">As of September 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 September 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 nine months ended September 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 September 30,
2013 and 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
September 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 September 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">
<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 September 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">27</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">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">27</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</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">15,273</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">15,273</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">15,300</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">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">27</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">15,273</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 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">12,391</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">—  </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">12,391</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">32</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">32</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">12,423</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">12,423</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>
<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="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 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">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>
<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
September 30, 2013 and 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="76%" align="center">
<tr>
<td width="62%"></td>
<td valign="bottom" width="17%"></td>
<td></td>
<td></td>
<td></td>
<td valign="bottom" width="17%"></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 valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>As of September 30,<br />
2013</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>As of December 31,<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">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">1.39</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">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">67.0</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">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">4.2</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">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>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font 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 tables set
forth a summary of the changes in the fair value of the
Company’s Level III financial liabilities for the three and
nine months ended September 30, 2013 and September 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">
<tr>
<td width="72%"></td>
<td valign="bottom" width="9%"></td>
<td></td>
<td></td>
<td></td>
<td valign="bottom" width="9%"></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 />
September 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>Nine Months<br />
Ended<br />
September 30,<br />
2013</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">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">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">7,500</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr>
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Change in fair value of
Level III liabilities</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">(5,466</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">) </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">4,923</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr style="FONT-SIZE: 1px">
<td valign="bottom"></td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 1px solid"> </p>
</td>
<td> </td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Fair value—end of
period</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">12,423</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">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">12,423</font></td>
<td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td>
</tr>
<tr style="FONT-SIZE: 1px">
<td valign="bottom"></td>
<td valign="bottom">  </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
<td valign="bottom"> </td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td valign="bottom">
<p style="BORDER-TOP: #000000 3px double"> </p>
</td>
<td> </td>
</tr>
<tr>
<td height="16"></td>
<td height="16" colspan="4"></td>
<td height="16" colspan="4"></td>
</tr>
<tr>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1">  </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>Three Months<br />
Ended<br />
September 30,<br />
2012</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>Nine Months<br />
Ended<br />
September 30,<br />
2012</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Fair value—beginning
of period</font></p>
</td>
<td valign="bottom"><font size="1">  </font></td>
<td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td>
<td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">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">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">—  </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">(169</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">(606</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">5,454</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">5,454</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>
</table>
</div>
13612000
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
September 30, 2013 and December 31, 2012:</font></p>
<p style="font-size:12px;margin-top:0px;margin-bottom:0px">
 </p>
<table cellspacing="0" cellpadding="0" width="76%" border="0" style="BORDER-COLLAPSE:COLLAPSE" align="center">
<tr>
<td width="62%"></td>
<td valign="bottom" width="17%"></td>
<td></td>
<td></td>
<td></td>
<td valign="bottom" width="17%"></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 valign="bottom" colspan="2" align="center"><font style="font-family:Times New Roman" size="1"><b>As of September 30,<br />
2013</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom"><font size="1"> </font></td>
<td valign="bottom" colspan="2" align="center"><font style="font-family:Times New Roman" size="1"><b>As of December 31,<br />
2012</b></font></td>
<td valign="bottom"><font size="1"> </font></td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="margin-left:1.00em; text-indent:-1.00em"><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">1.39</font></td>
<td nowrap="nowrap" valign="bottom"><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">0.72</font></td>
<td nowrap="nowrap" valign="bottom"><font style="font-family:Times New Roman" size="2">% </font></td>
</tr>
<tr>
<td valign="top">
<p style="margin-left:1.00em; text-indent:-1.00em"><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">67.0</font></td>
<td nowrap="nowrap" valign="bottom"><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">78.0</font></td>
<td nowrap="nowrap" valign="bottom"><font style="font-family:Times New Roman" size="2">% </font></td>
</tr>
<tr bgcolor="#CCEEFF">
<td valign="top">
<p style="margin-left:1.00em; text-indent:-1.00em"><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">4.2</font></td>
<td nowrap="nowrap" valign="bottom"><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">4.9</font></td>
<td nowrap="nowrap" valign="bottom"><font style="font-family:Times New Roman" size="2">  </font></td>
</tr>
<tr>
<td valign="top">
<p style="margin-left:1.00em; text-indent:-1.00em"><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 nowrap="nowrap" valign="bottom"><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">0.0</font></td>
<td nowrap="nowrap" valign="bottom"><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>
<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. The PIPE warrants are 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 September 30, 2013, the fair value of the PIPE warrants was
estimated to be $12.4 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 of the warrants resulted in other expense
of $2.4 million for the three months ended September 30, 2013
and $13.4 million in other expense for the nine months ended
September 30, 2013. The change in fair value for the three
months and nine months ended September 30, 2012, which was
recorded as other income, was $0.1 million and $0.4 million,
respectively.</font></p>
<p style="margin-top:12px;margin-bottom:0px"><font style="font-family:Times New Roman" size="2">During the three months
ended September 30, 2013, warrants to purchase 1,039,309
shares were net exercised for 747,225 shares of common stock.
During the nine months ended September 30, 2013, warrants to
purchase 1,135,589 shares were net exercised for 808,078 shares of
common stock. As of September 30, 2013, PIPE warrants to
purchase 1,494,514 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 months
ended September 30, 2013, warrants to purchase 137,254 shares
were net exercised, for 94,161 shares of common stock. During the
nine months ended September 30, 2013, warrants to purchase
274,508 shares were net exercised, for 183,404 shares of common
stock. As of September 30, 2013, no warrants to purchase
shares of common stock issued to Hercules were
outstanding.</font></p>
<p style="font-size:1px;margin-top:18px;margin-bottom:0px">
 </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
Initial Public Offering, or 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 September 30,
2013.</font></p>
</div>
1242000
1193000
0.01
P1Y
0.03
4923633
1497939
65765
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.
290000
742000
200000
4923000
0.670
0.000
0.0139
P4Y2M12D
13400000
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.
1135589
P6M
808078
P5Y
3.06
274508
274508
P7Y
183404
20961886
-18783000
-1.09
723000
1000
-21684000
1806000
23528000
-459000
0
-22840000
719000
-38000
608000
-22841000
-339000
381000
5290000
7434000
1633000
-4073000
497000
22403000
-478000
1765000
1328000
163000
0
467000
31527000
7276000
17113000
9077000
-606000
871000
762000
3321038
3136300
161096
406000
-606000
5828000
400000
3.94
228264
3.40
-128540000
6580000
4000
-142006000
22665000
137538000
-21815000
-458000
-163218000
5361000
-33000
250000
-12289000
-163222000
-709000
340000
33064000
211742000
8931000
60795000
54941000
3833000
147367000
9000000
1292000
8927000
1247000
2026000
3122000
32383000
99896000
-22407000
114303000
136057000
14967000
4361000
4570000
5600000
0
P1Y
0.780
0.000
0.0072
P4Y10M24D
228264
58580
22632573
-0.38
4000
-8192000
0
-8578000
166000
183000
-8582000
1410000
562000
8358000
573000
0
6948000
304000
258000
134000
-169000
100000
41462425
-0.26
5000
-8310000
0
-10981000
548000
-2328000
-10986000
2310000
876000
8858000
348000
0
6548000
449000
427000
85000
-5466000
2400000
1039309
747225
137254
94161
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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.