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1. ORGANIZATION AND BASIS OF PRESENTATION Sarepta Therapeutics, Inc., formerly AVI BioPharma, Inc., is a biopharmaceutical company incorporated in the State of Oregon on July 22, 1980. On July 10, 2012, the shareholders approved a proposal to change the name of the company to Sarepta Therapeutics, Inc. (“Sarepta” or the “Company”) and the change was effective on July 11, 2012. The Company is focused on the discovery and development of unique RNA-based therapeutics for the treatment of rare and infectious diseases. Applying the Company’s proprietary platform technologies, the Company is able to target a broad range of diseases and disorders through distinct RNA-based mechanisms of action. The Company is focused on rapidly advancing the development of its Duchenne muscular dystrophy drug candidates, including its lead product candidate, eteplirsen, which is currently in a Phase IIb clinical trial. The Company is also focused on developing therapeutics for the treatment of infectious diseases, including its lead infectious disease programs aimed at the development of drug candidates for the Ebola and Marburg hemorrhagic fever viruses for which the Company has historically received and expects to continue to receive significant financial support from U.S. government research contracts. The Company effected a one-for-six reverse stock split of its outstanding common stock on July 11, 2012. The accompanying unaudited condensed consolidated financial statements and related notes to the unaudited condensed consolidated financial statements give retroactive effect to the reverse stock split for all periods presented. The accompanying unaudited condensed consolidated financial statements reflect the accounts of Sarepta and its consolidated subsidiaries. The accompanying unaudited condensed consolidated balance sheet data as of December 31, 2011 was derived from audited financial statements not included in this report. The accompanying unaudited condensed consolidated financial statements were prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”) and the rules and regulations of the U.S. Securities and Exchange Commission (“SEC”) pertaining to interim financial statements. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. Management has determined that the Company operates in one segment: the development of pharmaceutical products on its own behalf or in collaboration with others. The accompanying unaudited condensed consolidated financial statements reflect all adjustments that are, in the opinion of management, necessary for a fair presentation of the financial position, results of operations and cash flows for the interim periods. The accompanying unaudited condensed consolidated financial statements should be read in conjunction with the financial statements and the notes thereto included in the Company’s annual report on Form 10-K for the year ended December 31, 2011. The results of operations for the interim periods presented are not necessarily indicative of the results to be expected for the full year. Since its inception in 1980, the Company has incurred losses of approximately $319.6 million, substantially all of which resulted from expenditures related to research and development, general and administrative charges and acquired in-process research and development resulting from two acquisitions. The Company has not generated any material revenue from product sales to date, and there can be no assurance that revenues from product sales will be achieved. Moreover, even if the Company does achieve revenue from product sales, the Company expects to incur operating losses over the next several years. In the periods presented, substantially all of the revenue generated by the Company was derived from research contracts with the U.S. government. As of June 30, 2012, the Company had completed all of its contracts with the U.S. government except for the July 2010 agreement for the development of therapeutics against Ebola and Marburg viruses. On August 2, 2012, the Company received a stop-work order related to the Ebola virus portion of this outstanding contract. The stop-work order does not apply to the Company’s ongoing Marburg activities. See “Note 6 — U.S. Government Contracts” for additional information. As of June 30, 2012, cash and cash equivalents were $24.5 million. The Company’s principal sources of liquidity have been equity financings and revenue from U.S. government research contracts. The Company anticipates receiving continued funding from the U.S. government to pursue the development of the Company’s therapeutics against the Marburg virus with uncertainty regarding continued funding of Ebola as described elsewhere and is likely to pursue additional funding through public or private financings and cash generated from establishing collaborations. The Company’s principal uses of cash are research and development expenses, general and administrative expenses and other working capital requirements. Many of these uses of cash are discretionary in nature and can be significantly reduced at the direction of the Company’s management and Board of Directors. Combined together, these sources of cash and reductions in discretionary spending the Company could implement provide sufficient cash to fund the Company’s operations for at least the following 12 months. Should the Company’s funding from the U.S. government cease or be delayed, it would have a negative impact on the Company’s financial condition and the Company would be forced to significantly reduce research and development efforts and other discretionary spending. Estimates and Uncertainties The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. Actual results could differ from those estimates. Commitments and Contingencies As of the date of this report, the Company is not a party to any material legal proceedings with respect to itself, its subsidiaries, or any of its material properties. In the normal course of business, the Company may from time to time be named as a party to various legal claims, actions and complaints, including matters involving employment, intellectual property, effects from the use of therapeutics utilizing its technology, professional services or others. It is impossible to predict whether any resulting liability would have a material adverse effect on the Company’s financial position, results of operations or cash flows. In May 2012, the Company exercised its option to terminate its lease obligation for its laboratory facility in Bothell, Washington, effective May 2013, decreasing its future commitment by approximately $400,000 in 2013 and $629,000 in 2014. Reclassifications Certain inception to date amounts have been reclassified to conform to current year presentation. These changes did not have a significant impact on the Company’s net loss, assets, liabilities, shareholders’ equity (deficit) or cash flows.

2. NET INCOME (LOSS) PER SHARE Basic net income (loss) per share is computed by dividing net income (loss) by the weighted-average number of common shares outstanding. Diluted net income (loss) per share is computed by dividing net income (loss) by the weighted-average number of common shares and dilutive common stock equivalent shares outstanding.   <table cellspacing="0" cellpadding="0" width="92%" border="0" style="border-collapse:collapse; text-align: left" align="center">  <tr> <td width="55%"> </td> <td valign="bottom" width="7%"> </td> <td> </td> <td> </td> <td> </td> <td valign="bottom" width="7%"> </td> <td> </td> <td> </td> <td> </td> <td valign="bottom" width="7%"> </td> <td> </td> <td> </td> <td> </td> <td valign="bottom" width="7%"> </td> <td> </td> <td> </td> <td> </td> </tr> <tr> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="6" align="center" style="border-bottom:1px solid #000000">Three Months Ended June 30,</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="6" align="center" style="border-bottom:1px solid #000000">Six Months Ended June 30,</td> <td valign="bottom"> </td> </tr> <tr> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">2012</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">2011</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">2012</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">2011</td> <td valign="bottom"> </td> </tr> <tr> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="6" align="center">(in thousands, except per share data)</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="6" align="center">(in thousands, except per share data)</td> <td valign="bottom"> </td> </tr>   <tr bgcolor="#cceeff"> <td valign="top"> Net income (loss) </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">8,038</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">1,279</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">(9,666</td> <td nowrap="nowrap" valign="bottom">) </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">3,112</td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr> <td valign="top"> Weighted-average number of shares of common stock and common stock equivalents outstanding: </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> </tr> <tr bgcolor="#cceeff"> <td valign="top"> Weighted-average number of common shares outstanding for computing basic earnings per share </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">22,624</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">22,348</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">22,624</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">20,558</td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr> <td valign="top"> Dilutive effect of warrants and stock options after application of the treasury stock method* </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">34</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">805</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">—  </td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">1,112</td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr style="font-size:1px"> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> </tr> <tr bgcolor="#cceeff"> <td valign="top"> Weighted-average number of common shares outstanding for computing diluted earnings per share </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">22,658</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">23,153</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">22,624</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">21,670</td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr style="font-size:1px"> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> </tr> <tr> <td valign="top"> Net income (loss) per share — basic </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">0.36</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">0.06</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">(0.43</td> <td nowrap="nowrap" valign="bottom">) </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">0. 15</td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr style="font-size:1px"> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> </tr> <tr bgcolor="#cceeff"> <td valign="top"> Net income (loss) per share — dilutive </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">0.35</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">0.06</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">(0.43</td> <td nowrap="nowrap" valign="bottom">) </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">0.14</td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr style="font-size:1px"> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> </tr>  </table>   <table style="border-collapse:collapse; text-align: left" border="0" cellpadding="0" cellspacing="0" width="100%"> <tr> <td width="2%" valign="top" align="left">*</td> <td align="left" valign="top">Warrants and stock options to purchase 6,949,231 and 3,926,350 shares of common stock were excluded from the net income (loss) per share calculation for the three months ended June 30, 2012 and 2011, respectively, as their effect would have been anti-dilutive. Additionally, warrants and stock options to purchase 6,992,316 and 2,251,563 shares of common stock were excluded from the net income (loss) per share calculation for the six months ended June 30, 2012 and 2011, respectively, as their effect would have been anti-dilutive. </td> </tr> </table>

3. FAIR VALUE MEASUREMENTS The Company measures at fair value certain financial assets and liabilities in accordance with a hierarchy of valuation techniques based on whether the inputs to those valuation techniques are observable or unobservable. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect the Company’s market assumptions. There are three levels of inputs that may be used to measure fair-value:   <table style="border-collapse:collapse; text-align: left" border="0" cellpadding="0" cellspacing="0" width="100%"> <tr> <td width="5%"> </td> <td width="2%" valign="top" align="left">•</td> <td width="1%" valign="top"> </td> <td align="left" valign="top"> Level 1 — quoted prices for identical instruments in active markets; </td> </tr> </table>   <table style="border-collapse:collapse; text-align: left" border="0" cellpadding="0" cellspacing="0" width="100%"> <tr> <td width="5%"> </td> <td width="2%" valign="top" align="left">•</td> <td width="1%" valign="top"> </td> <td align="left" valign="top"> Level 2 — quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, and model-derived valuations in which all significant inputs and significant value drivers are observable in active markets; and </td> </tr> </table>   <table style="border-collapse:collapse; text-align: left" border="0" cellpadding="0" cellspacing="0" width="100%"> <tr> <td width="5%"> </td> <td width="2%" valign="top" align="left">•</td> <td width="1%" valign="top"> </td> <td align="left" valign="top"> Level 3 — valuations derived from valuation techniques in which one or more significant value drivers are unobservable. </td> </tr> </table> The Company’s assets and liabilities measured at fair value on a recurring basis consisted of the following as of the date indicated:   <table cellspacing="0" cellpadding="0" width="92%" border="0" style="border-collapse:collapse; text-align: left" align="center">  <tr> <td width="68%"> </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"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="14" align="center" style="border-bottom:1px solid #000000">    Fair Value Measurement as of June 30, 2012     </td> <td valign="bottom"> </td> </tr> <tr> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">Total</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">Level 1</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">Level 2</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">Level 3</td> <td valign="bottom"> </td> </tr> <tr> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="14" align="center">(in thousands)</td> <td valign="bottom"> </td> </tr>   <tr> <td height="8"> </td> <td height="8" colspan="4"> </td> <td height="8" colspan="4"> </td> <td height="8" colspan="4"> </td> <td height="8" colspan="4"> </td> </tr> <tr bgcolor="#cceeff"> <td valign="top"> Cash and Cash equivalents </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">24,491</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">24,491</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td nowrap="nowrap" valign="bottom">$</td> <td nowrap="nowrap" valign="bottom" align="right">—  </td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td nowrap="nowrap" valign="bottom">$</td> <td nowrap="nowrap" valign="bottom" align="right">—  </td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr style="font-size:1px"> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> </tr> <tr> <td valign="top"> Total assets </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">24,491</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">24,491</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td nowrap="nowrap" valign="bottom">$</td> <td nowrap="nowrap" valign="bottom" align="right">—  </td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td nowrap="nowrap" valign="bottom">$</td> <td nowrap="nowrap" valign="bottom" align="right">—  </td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr style="font-size:1px"> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> </tr>  </table>   <table cellspacing="0" cellpadding="0" width="92%" border="0" style="border-collapse:collapse; text-align: left" align="center">  <tr> <td width="68%"> </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"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="14" align="center" style="border-bottom:1px solid #000000">    Fair Value Measurement as of June 30, 2012     </td> <td valign="bottom"> </td> </tr> <tr> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">Total</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">Level 1</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">Level 2</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">Level 3</td> <td valign="bottom"> </td> </tr> <tr> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="14" align="center">(in thousands)</td> <td valign="bottom"> </td> </tr>   <tr> <td height="8"> </td> <td height="8" colspan="4"> </td> <td height="8" colspan="4"> </td> <td height="8" colspan="4"> </td> <td height="8" colspan="4"> </td> </tr> <tr bgcolor="#cceeff"> <td valign="top"> Warrants* </td> <td valign="bottom"> </td> <td nowrap="nowrap" valign="bottom">$</td> <td nowrap="nowrap" valign="bottom" align="right">2,884</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td nowrap="nowrap" valign="bottom">$</td> <td nowrap="nowrap" valign="bottom" align="right">—  </td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td nowrap="nowrap" valign="bottom">$</td> <td nowrap="nowrap" valign="bottom" align="right">—  </td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td nowrap="nowrap" valign="bottom">$</td> <td nowrap="nowrap" valign="bottom" align="right">2,884</td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr style="font-size:1px"> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> </tr> <tr> <td valign="top"> Total liabilities </td> <td valign="bottom"> </td> <td nowrap="nowrap" valign="bottom">$</td> <td nowrap="nowrap" valign="bottom" align="right">  2,884</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td nowrap="nowrap" valign="bottom">$</td> <td nowrap="nowrap" valign="bottom" align="right">—  </td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td nowrap="nowrap" valign="bottom">$</td> <td nowrap="nowrap" valign="bottom" align="right">—  </td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td nowrap="nowrap" valign="bottom">$</td> <td nowrap="nowrap" valign="bottom" align="right">  2,884</td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr style="font-size:1px"> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> </tr>  </table>   <table cellspacing="0" cellpadding="0" width="92%" border="0" style="border-collapse:collapse; text-align: left" align="center">  <tr> <td width="68%"> </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"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="14" align="center" style="border-bottom:1px solid #000000">Fair Value Measurement as of December 31, 2011</td> <td valign="bottom"> </td> </tr> <tr> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">Total</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">Level 1</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">Level 2</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">Level 3</td> <td valign="bottom"> </td> </tr> <tr> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="14" align="center">(in thousands)</td> <td valign="bottom"> </td> </tr>   <tr> <td height="8"> </td> <td height="8" colspan="4"> </td> <td height="8" colspan="4"> </td> <td height="8" colspan="4"> </td> <td height="8" colspan="4"> </td> </tr> <tr bgcolor="#cceeff"> <td valign="top"> Cash and Cash equivalents </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">39,904</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">39,904</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">—  </td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">—  </td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr style="font-size:1px"> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> </tr> <tr> <td valign="top"> Total assets </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">39,904</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">39,904</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">—  </td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">—  </td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr style="font-size:1px"> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> </tr>  </table>   <table cellspacing="0" cellpadding="0" width="92%" border="0" style="border-collapse:collapse; text-align: left" align="center">  <tr> <td width="68%"> </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"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="14" align="center" style="border-bottom:1px solid #000000">Fair Value Measurement as of December 31, 2011</td> <td valign="bottom"> </td> </tr> <tr> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">Total</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">Level 1</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">Level 2</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">Level 3</td> <td valign="bottom"> </td> </tr> <tr> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="14" align="center">(in thousands)</td> <td valign="bottom"> </td> </tr>   <tr> <td height="8"> </td> <td height="8" colspan="4"> </td> <td height="8" colspan="4"> </td> <td height="8" colspan="4"> </td> <td height="8" colspan="4"> </td> </tr> <tr bgcolor="#cceeff"> <td valign="top"> Warrants* </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">5,446</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">—  </td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">—  </td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">5,446</td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr style="font-size:1px"> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> </tr> <tr> <td valign="top"> Total liabilities </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">  5,446</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">—  </td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">—  </td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">  5,446</td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr style="font-size:1px"> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> </tr>  </table>   <table style="border-collapse:collapse; text-align: left" border="0" cellpadding="0" cellspacing="0" width="100%"> <tr> <td width="2%" valign="top" align="left">*</td> <td align="left" valign="top">See Note 5 —“Warrants” for additional information related to the determination of fair value of the warrants and a reconciliation of changes in fair value. </td> </tr> </table> The carrying amounts reported in the balance sheets for accounts receivable, accounts payable, and other current monetary assets and liabilities approximate fair value because of the immediate or short-term maturity of these financial instrument and carrying amounts reported for long-term debt approximate fair value because of similar characteristics to other debt instruments with comparable risk.

4. ACCOUNTS RECEIVABLE Accounts receivable are stated at invoiced amount and do not bear interest. Because all accounts receivable are from the U.S. government and historically no amounts have been written off, an allowance for doubtful accounts receivable is not considered necessary. The accounts receivable balance included $4,217,000 and $2,093,000 of U.S. government receivables that were unbilled at June 30, 2012 and December 31, 2011, respectively.

5. WARRANTS Warrants issued in connection with the Company’s December 2007, January 2009, and August 2009 common stock offerings are classified as liabilities opposed to equity due to their settlement terms which requires settlement in registered shares. These warrants are non-cash liabilities and the Company is not required to expend any cash to settle these liabilities. All other warrants issued by the Company were recorded as additional paid-in-capital and no further adjustments are made. The fair value of the warrants classified as liabilities was recorded on the balance sheet at issuance and are adjusted to fair value at each financial reporting period, with changes in the fair value recorded as a gain or loss in the statement of operations. The fair value is determined using the Black-Scholes option-pricing model, which requires the use of significant judgment and estimates for the inputs used in the model. The following reflects the weighted-average assumptions for each of the periods indicated:   <table cellspacing="0" cellpadding="0" width="76%" border="0" style="border-collapse:collapse; text-align: left" align="center">  <tr> <td width="67%"> </td> <td valign="bottom" width="14%"> </td> <td> </td> <td> </td> <td> </td> <td valign="bottom" width="14%"> </td> <td> </td> <td> </td> <td> </td> </tr> <tr> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="6" align="center" style="border-bottom:1px solid #000000">Three and Six Months Ended June 30,</td> <td valign="bottom"> </td> </tr> <tr> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">2012</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">2011</td> <td valign="bottom"> </td> </tr>   <tr bgcolor="#cceeff"> <td valign="top"> Risk-free interest rate </td> <td valign="bottom"> </td> <td nowrap="nowrap" valign="bottom"> </td> <td nowrap="nowrap" valign="bottom" align="right">0.2%-0.3</td> <td nowrap="nowrap" valign="bottom">% </td> <td valign="bottom"> </td> <td nowrap="nowrap" valign="bottom"> </td> <td nowrap="nowrap" valign="bottom" align="right">0.5%-1.3</td> <td nowrap="nowrap" valign="bottom">% </td> </tr> <tr> <td valign="top"> Expected dividend yield </td> <td valign="bottom"> </td> <td nowrap="nowrap" valign="bottom"> </td> <td nowrap="nowrap" valign="bottom" align="right">0</td> <td nowrap="nowrap" valign="bottom">% </td> <td valign="bottom"> </td> <td nowrap="nowrap" valign="bottom"> </td> <td nowrap="nowrap" valign="bottom" align="right">0</td> <td nowrap="nowrap" valign="bottom">% </td> </tr> <tr bgcolor="#cceeff"> <td valign="top"> Expected lives </td> <td valign="bottom"> </td> <td nowrap="nowrap" valign="bottom"> </td> <td nowrap="nowrap" valign="bottom" align="right">0.5-2.2 years</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td nowrap="nowrap" valign="bottom"> </td> <td nowrap="nowrap" valign="bottom" align="right">1.5-3.4 years</td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr> <td valign="top"> Expected volatility </td> <td valign="bottom"> </td> <td nowrap="nowrap" valign="bottom"> </td> <td nowrap="nowrap" valign="bottom" align="right">71.8%-90.5</td> <td nowrap="nowrap" valign="bottom">% </td> <td valign="bottom"> </td> <td nowrap="nowrap" valign="bottom"> </td> <td nowrap="nowrap" valign="bottom" align="right">55.3%-88.5</td> <td nowrap="nowrap" valign="bottom">% </td> </tr> <tr bgcolor="#cceeff"> <td valign="top"> Shares underlying warrants classified as liabilities </td> <td valign="bottom"> </td> <td nowrap="nowrap" valign="bottom"> </td> <td nowrap="nowrap" valign="bottom" align="right">4,824,827</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td nowrap="nowrap" valign="bottom"> </td> <td nowrap="nowrap" valign="bottom" align="right">4,824,827</td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr> <td valign="top"> Market value of stock at beginning of year </td> <td valign="bottom"> </td> <td nowrap="nowrap" valign="bottom">$</td> <td nowrap="nowrap" valign="bottom" align="right">4.50</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td nowrap="nowrap" valign="bottom">$</td> <td nowrap="nowrap" valign="bottom" align="right">12.72</td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr bgcolor="#cceeff"> <td valign="top"> Market value of stock at end of period </td> <td valign="bottom"> </td> <td nowrap="nowrap" valign="bottom">$</td> <td nowrap="nowrap" valign="bottom" align="right">3.78</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td nowrap="nowrap" valign="bottom">$</td> <td nowrap="nowrap" valign="bottom" align="right">8.58</td> <td nowrap="nowrap" valign="bottom"> </td> </tr>  </table> A reconciliation of the change in value of the Company’s warrant liability for the three and six months ended June 30, 2012 is as follows:   <table cellspacing="0" cellpadding="0" width="76%" border="0" style="border-collapse:collapse; text-align: left" align="center">  <tr> <td width="63%"> </td> <td valign="bottom" width="14%"> </td> <td> </td> <td> </td> <td> </td> <td valign="bottom" width="14%"> </td> <td> </td> <td> </td> <td> </td> </tr> <tr> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">Three Months Ended June 30, 2012</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">Six Months Ended June 30, 2012</td> <td valign="bottom"> </td> </tr> <tr> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center">(in thousands)</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center">(in thousands)</td> <td valign="bottom"> </td> </tr>   <tr> <td height="8"> </td> <td height="8" colspan="4"> </td> <td height="8" colspan="4"> </td> </tr> <tr bgcolor="#cceeff"> <td valign="top"> Balance at beginning of period </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">16,372</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">5,446</td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr> <td valign="top"> Increase (Decrease) in value of warrants </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(13,488</td> <td nowrap="nowrap" valign="bottom">) </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(2,562</td> <td nowrap="nowrap" valign="bottom">) </td> </tr> <tr bgcolor="#cceeff"> <td valign="top"> Reclassification to shareholders’ equity upon exercise of warrants </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">—  </td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">—  </td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr style="font-size:1px"> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> </tr> <tr> <td valign="top"> Balance at June 30, 2012 </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">2,884</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">2,884</td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr style="font-size:1px"> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> </tr>  </table> The following table summarizes information about warrants outstanding at June 30, 2012.   <table cellspacing="0" cellpadding="0" width="84%" border="0" style="border-collapse:collapse; text-align: left" align="center">  <tr> <td> </td> <td> </td> <td> </td> <td valign="bottom" width="20%"> </td> <td> </td> <td> </td> <td> </td> <td valign="bottom" width="20%"> </td> <td> </td> <td valign="bottom" width="20%"> </td> <td> </td> <td> </td> <td> </td> </tr> <tr> <td valign="bottom" colspan="2" nowrap="nowrap" align="center" style="border-bottom:1px solid #000000">Exercise Price</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">Outstanding Warrants at June 30, 2012</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="center" style="border-bottom:1px solid #000000">Weighted Average Remaining Contractual Life (Years)</td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">Exercisable Warrants</td> <td valign="bottom"> </td> </tr>   <tr bgcolor="#cceeff"> <td valign="top">$</td> <td valign="top" align="right">0.0018</td> <td nowrap="nowrap" valign="top"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">2,778</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="center">No expiration date</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">2,778</td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr> <td valign="top"> </td> <td valign="top" align="right">1.0074</td> <td nowrap="nowrap" valign="top"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">39,705</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="center">0.4</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">39,705</td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr bgcolor="#cceeff"> <td valign="top"> </td> <td valign="top" align="right">6.84</td> <td nowrap="nowrap" valign="top"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">167</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="center">No expiration date</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">167</td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr> <td valign="top"> </td> <td valign="top" align="right">6.96</td> <td nowrap="nowrap" valign="top"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">2,354,034</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="center">2.1</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">2,354,034</td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr bgcolor="#cceeff"> <td valign="top"> </td> <td valign="top" align="right">8.70</td> <td nowrap="nowrap" valign="top"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">11,024</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="center">1.6</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">11,024</td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr> <td valign="top"> </td> <td valign="top" align="right">10.68</td> <td nowrap="nowrap" valign="top"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">1,568,385</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="center">2.2</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">1,568,385</td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr bgcolor="#cceeff"> <td valign="top"> </td> <td valign="top" align="right">14.70</td> <td nowrap="nowrap" valign="top"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">891,385</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="center">0.5</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">891,385</td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr style="font-size:1px"> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> </tr> <tr> <td valign="top"> </td> <td valign="top"> </td> <td valign="top"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">4,867,478</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">4,867,478</td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr style="font-size:1px"> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> </tr>  </table>

6. U.S. GOVERNMENT CONTRACTS The Company recognizes revenues from U.S. government research contracts during the period in which the related expenditures are incurred and presents these revenues and related expenses gross in the consolidated financial statements. In the periods presented, all of the revenue generated by the Company was derived from research contracts with and grants from the U.S. government. As of June 30, 2012, the Company had completed all of its contracts with the U.S. government except for the July 2010 agreement for the development of therapeutics against Ebola and Marburg. The following table sets forth the revenue for each of the contracts with the U.S. government for the three months ended June 30, 2012 and 2011.   <table cellspacing="0" cellpadding="0" width="92%" border="0" style="border-collapse:collapse; text-align: left" align="center">  <tr> <td width="68%"> </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> <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"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="6" align="center" style="border-bottom:1px solid #000000">Three Months Ended June 30,</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="6" align="center" style="border-bottom:1px solid #000000">Six Months Ended June 30,</td> <td valign="bottom"> </td> </tr> <tr> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">2012</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">2011</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">2012</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">2011</td> <td valign="bottom"> </td> </tr> <tr> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="6" align="center">(in thousands)</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="6" align="center">(in thousands)</td> <td valign="bottom"> </td> </tr>   <tr bgcolor="#cceeff"> <td valign="top"> July 2010 Agreement (Ebola and Marburg) </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">11,171</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">10,585</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">22,334</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">22,490</td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr> <td valign="top"> June 2010 Agreement (H1N1) </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">—  </td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">883</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">—  </td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">3,207</td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr bgcolor="#cceeff"> <td valign="top"> Other Agreements </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">36</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">117</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">85</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">184</td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr style="font-size:1px"> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> </tr> <tr> <td valign="top"> Total </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">11,207</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">11,585</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">22,419</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">25,881</td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr style="font-size:1px"> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> </tr>  </table> July 2010 Agreement (Ebola and Marburg) On July 14, 2010, the Company was awarded a contract with the U.S. Department of Defense, or DoD, Chemical and Biological Defense Program through the U.S. Army Space and Missile Defense Command for the advanced development of the Company’s hemorrhagic fever virus therapeutic candidates, AVI-6002 and AVI-6003, against the Ebola and Marburg viruses, respectively. In February 2012, the Company announced that it received permission from the FDA to proceed with a single oligomer, AVI-7288, as the lead product candidate against the Marburg virus infection. In July 2012, the Company received similar permission to proceed with AVI-7537 as a single oligomer against the Ebola virus infection. The contract is structured into four segments for each therapeutic candidate and has an aggregate period of performance spanning approximately six years if DoD exercises its options for all segments. Activities under the first segment began in July 2010 and include Phase I studies in healthy volunteers as well as preclinical studies which are scheduled to be completed in mid 2013. The aggregate available funding as of June 30, 2012 for the current segments is approximately $126.5 million of which $75.0 million has been recognized to date. After completion of the first segment, and each successive segment, DoD has the option to proceed to the next segment for either or both AVI-7537 and AVI-7288. If DoD exercises its options for all four segments for both AVI-7537 and AVI-7288, contract activities would include all clinical and licensure activities necessary to obtain Food and Drug Administration (FDA) regulatory approval for each therapeutic candidate and would provide for a total funding award to the Company of up to $288.0 million over a period of six years, of which $161.5 million remains to be funded as of June 30, 2012. In July 2012, the Company submitted a contract modification to the DoD to proceed with single oligomers, AVI-7537 and AVI-7288, as the lead product candidates against the Ebola and Marburg virus infections, respectively. The FDA previously approved the change and if the DoD approves the contract modification, the total funding award and the amount funded for the current segments of the contract will be reduced by $4.5 million. On August 2, 2012, the Company received a stop-work order from the DoD with respect to AVI-7537, its product candidate for use against the Ebola virus. The stop-work order stated that the action is being taken due to recently imposed funding constraints. The stop-work order does not apply to AVI-7288, the Company’s ongoing effort against the Marburg virus funded under the same contract. The stop-work order will remain in effect until September 1, 2012, at which time the DoD will either: 1) terminate AVI-7537, the Ebola portion of the contract; 2) cancel the stop-work order; or 3) extend the stop-work order period, if necessary. While the final outcome for the AVI-7537 portion of the contract is yet to be determined, if the AVI-7537 portion of the contract is terminated, the funding for the first segment would be reduced from $126.5 million to an estimate of approximately $100 million including the July 2012 contract modification request described above. Additionally, the total funding under the contract of $288 million would be reduced to approximately $183 million. June 2010 Agreement (H1N1/Influenza) On June 4, 2010, the Company entered into a contract with the Defense Threat Reduction Agency to advance the development of AVI-7100 as a medical countermeasure against the pandemic H1N1 influenza virus in cooperation with the Transformational Medical Technologies program of DoD. The period of performance for this contract ended on June 3, 2011.

7. STOCK COMPENSATION Stock Options In general, stock options granted prior to December 31, 2010 vest over a three year period, with one-third of the underlying shares vesting on each anniversary of grant, and have a ten year term. Beginning in January 2011, stock options granted generally vest over a four year period, with one-fourth of the underlying shares vesting on the first anniversary of the grant and the remaining underlying shares vesting pro-ratably on a monthly basis thereafter, such that the underlying shares will be fully vested on the fourth anniversary of the grant. As of June 30, 2012, 2,140,566 shares of common stock remain available for future grant.   A summary of the Company’s stock option activity with respect to the six months ended June 30, 2012 follows:   <table cellspacing="0" cellpadding="0" width="92%" border="0" style="border-collapse:collapse; text-align: left" align="center">  <tr> <td width="61%"> </td> <td valign="bottom" width="5%"> </td> <td> </td> <td> </td> <td> </td> <td valign="bottom" width="5%"> </td> <td> </td> <td> </td> <td> </td> <td valign="bottom" width="5%"> </td> <td> </td> <td> </td> <td> </td> <td valign="bottom" width="5%"> </td> <td> </td> <td> </td> <td> </td> </tr> <tr> <td valign="bottom" nowrap="nowrap"> Stock Options </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">Underlying Shares</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">Weighted Average Exercise Price</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">Weighted Average Remaining Contractual Term</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">Aggregate Intrinsic Value</td> <td valign="bottom"> </td> </tr>   <tr> <td height="8"> </td> <td height="8" colspan="4"> </td> <td height="8" colspan="4"> </td> <td height="8" colspan="4"> </td> <td height="8" colspan="4"> </td> </tr> <tr bgcolor="#cceeff"> <td valign="top"> Outstanding at December 31, 2011 </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">2,417,659</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">11.18</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> </tr> <tr> <td valign="top"> Granted </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">206,408</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">6.95</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> </tr> <tr bgcolor="#cceeff"> <td valign="top"> Exercised </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(111</td> <td nowrap="nowrap" valign="bottom">) </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">5.52</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> </tr> <tr> <td valign="top"> Canceled or expired </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(499,118</td> <td nowrap="nowrap" valign="bottom">) </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">10.16</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> </tr> <tr style="font-size:1px"> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> </tr> <tr bgcolor="#cceeff"> <td valign="top"> Outstanding at June 30, 2012 </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">2,124,838</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">11.01</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">6.68</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">13,578</td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr style="font-size:1px"> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> </tr> <tr> <td height="8"> </td> <td height="8" colspan="4"> </td> <td height="8" colspan="4"> </td> <td height="8" colspan="4"> </td> <td height="8" colspan="4"> </td> </tr> <tr> <td valign="top"> Vested at June 30, 2012 and expected to vest </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">2,050,432</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">11.12</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">6.47</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">12,584</td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr style="font-size:1px"> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> </tr> <tr> <td height="8"> </td> <td height="8" colspan="4"> </td> <td height="8" colspan="4"> </td> <td height="8" colspan="4"> </td> <td height="8" colspan="4"> </td> </tr> <tr bgcolor="#cceeff"> <td valign="top"> Exercisable at June 30, 2012 </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">994,370</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">14.31</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">3.81</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">78</td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr style="font-size:1px"> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> </tr>  </table> The weighted-average fair value per share of stock-based awards granted to employees during the three months ended June 30, 2012 and 2011 was $3.53 and $6.30, respectively, and during the six months ended June 30, 2012 and 2011 was $4.56 and $7.98, respectively. During the six months ended June 30, 2012 and 2011, the total intrinsic value of stock options exercised was $280 and $70,000 respectively, and the total grant date fair value of stock options that vested was $2,689,000 and $1,807,000, respectively. Valuation Assumptions Stock-based compensation costs are based on the fair value calculated from the Black-Scholes option-pricing model on the date of grant for stock options. The fair value of stock grants, with consideration given to estimated forfeitures, is amortized as compensation expense on a straight-line basis over the vesting period of the grants. The fair values of stock options granted during the periods presented were measured on the date of grant using the Black-Scholes option-pricing model, with the following assumptions:   <table cellspacing="0" cellpadding="0" width="76%" border="0" style="border-collapse:collapse; text-align: left" align="center">  <tr> <td width="71%"> </td> <td valign="bottom" width="5%"> </td> <td> </td> <td> </td> <td> </td> <td valign="bottom" width="5%"> </td> <td> </td> <td> </td> <td> </td> </tr> <tr> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="6" align="center" style="border-bottom:1px solid #000000">Three and Six Months Ended June 30,</td> <td valign="bottom"> </td> </tr> <tr> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">2012</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">2011</td> <td valign="bottom"> </td> </tr>   <tr> <td height="8"> </td> <td height="8" colspan="4"> </td> <td height="8" colspan="4"> </td> </tr> <tr bgcolor="#cceeff"> <td valign="top"> Risk-free interest rate </td> <td valign="bottom"> </td> <td nowrap="nowrap" valign="bottom"> </td> <td nowrap="nowrap" valign="bottom" align="right">0.8%-1.1</td> <td nowrap="nowrap" valign="bottom">% </td> <td valign="bottom"> </td> <td nowrap="nowrap" valign="bottom"> </td> <td nowrap="nowrap" valign="bottom" align="right">1.9%-2.4</td> <td nowrap="nowrap" valign="bottom">% </td> </tr> <tr> <td valign="top"> Expected dividend yield </td> <td valign="bottom"> </td> <td nowrap="nowrap" valign="bottom"> </td> <td nowrap="nowrap" valign="bottom" align="right">0</td> <td nowrap="nowrap" valign="bottom">% </td> <td valign="bottom"> </td> <td nowrap="nowrap" valign="bottom"> </td> <td nowrap="nowrap" valign="bottom" align="right">0</td> <td nowrap="nowrap" valign="bottom">% </td> </tr> <tr bgcolor="#cceeff"> <td valign="top"> Expected lives </td> <td valign="bottom"> </td> <td nowrap="nowrap" valign="bottom"> </td> <td nowrap="nowrap" valign="bottom" align="right">5.3 years</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td nowrap="nowrap" valign="bottom"> </td> <td nowrap="nowrap" valign="bottom" align="right">5.4-5.5 years</td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr> <td valign="top"> Expected volatility </td> <td valign="bottom"> </td> <td nowrap="nowrap" valign="bottom"> </td> <td nowrap="nowrap" valign="bottom" align="right">79.7%-82.5</td> <td nowrap="nowrap" valign="bottom">% </td> <td valign="bottom"> </td> <td nowrap="nowrap" valign="bottom"> </td> <td nowrap="nowrap" valign="bottom" align="right">80.9%-81.6</td> <td nowrap="nowrap" valign="bottom">% </td> </tr>  </table> Restricted Stock Units In April 2012, the Company granted 32,377 shares of restricted stock units to employees in lieu of cash for a portion of the 2012 bonus. These shares vest over a two-year period and have a weighted average grant date fair value of $5.40 per share. The weighted-average grant-date fair value of restricted stock unit awards is based on the market price of the Company’s common stock on the date of grant. The following table sets forth restricted stock unit activity for the period shown:   <table cellspacing="0" cellpadding="0" width="76%" border="0" style="border-collapse:collapse; text-align: left" align="center">  <tr> <td width="67%"> </td> <td valign="bottom" width="12%"> </td> <td> </td> <td> </td> <td> </td> <td valign="bottom" width="12%"> </td> <td> </td> <td> </td> <td> </td> </tr> <tr> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="6" align="center" style="border-bottom:1px solid #000000">Six Months Ended June 30, 2012</td> <td valign="bottom"> </td> </tr> <tr> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center">Shares</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center"> Weighted Average Grant Date Fair Value per Share </td> <td valign="bottom"> </td> </tr>   <tr bgcolor="#cceeff"> <td valign="top"> Restricted Stock Units, beginning of period </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">—  </td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">—  </td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr> <td valign="top"> Granted </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">32,377</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">5.40</td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr bgcolor="#cceeff"> <td valign="top"> Vested </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">—  </td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">—  </td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr> <td valign="top"> Forfeited or canceled </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(486</td> <td nowrap="nowrap" valign="bottom">) </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">5.40</td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr style="font-size:1px"> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> </tr> <tr bgcolor="#cceeff"> <td valign="top"> Restricted Stock Units, end of period </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">31,891</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">5.40</td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr style="font-size:1px"> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> </tr>  </table>   Stock-based Compensation Expense A summary of the stock-based compensation expense, including options, restricted stock units, and restricted stock, recognized in the statements of operations is as follows:   <table cellspacing="0" cellpadding="0" width="92%" border="0" style="border-collapse:collapse; text-align: left" align="center">  <tr> <td width="54%"> </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="8%"> </td> <td> </td> <td> </td> <td> </td> </tr> <tr> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="6" align="center" style="border-bottom:1px solid #000000">Three Months Ended</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="6" align="center" style="border-bottom:1px solid #000000">Six Months Ended</td> <td valign="bottom"> </td> </tr> <tr> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">June 30, 2012</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">June 30, 2011</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">June 30, 2012</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">June 30, 2011</td> <td valign="bottom"> </td> </tr> <tr> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="6" align="center">(in thousands)</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="6" align="center">(in thousands)</td> <td valign="bottom"> </td> </tr>   <tr> <td height="8"> </td> <td height="8" colspan="4"> </td> <td height="8" colspan="4"> </td> <td height="8" colspan="4"> </td> <td height="8" colspan="4"> </td> </tr> <tr bgcolor="#cceeff"> <td valign="top"> Research and development </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">259</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">359</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">512</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">732</td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr> <td valign="top"> General and administrative </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">181</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">357</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">636</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">1,130</td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr style="font-size:1px"> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> </tr> <tr bgcolor="#cceeff"> <td valign="top"> Total </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">440</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">716</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">1,148</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">1,862</td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr style="font-size:1px"> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> </tr>  </table> As of June 30, 2012, there was $5,529,000 of unrecognized compensation cost related to non-vested share-based compensation arrangements granted, including stock options, restricted stock units and restricted stock. These costs are expected to be recognized over a weighted-average period of 3.0 years.

8. INCOME TAXES At December 31, 2011, the Company had net deferred tax assets of approximately $116.8 million. The net deferred tax assets are primarily composed of U.S. federal and state tax net operating loss carryforwards, U.S. federal and state research and development credit carryforwards and share-based compensation expense. Due to uncertainties surrounding the Company’s ability to generate future taxable income to realize these assets, a full valuation allowance has been established to offset its net deferred tax asset. Additionally, the Internal Revenue Code rules could limit the future use of its net operating loss and research and development credit carryforwards to offset future taxable income based on ownership changes and the value of the Company’s stock.

9. RESTRUCTURING In December 2011, the Company restructured its operations by reducing its workforce by 28%. Restructuring charges totaling $1,145,000 were recorded in 2011 and included severance and related costs. The restructuring was completed by January 31, 2012 and all severance costs are expected to be paid by December 2012. Changes in the liability and the balance related to the December 2011 restructuring plan are as follows:   <table cellspacing="0" cellpadding="0" width="76%" border="0" style="border-collapse:collapse; text-align: left" align="center">  <tr> <td width="81%"> </td> <td valign="bottom" width="17%"> </td> <td> </td> <td> </td> <td> </td> </tr> <tr> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">Six Months Ending June 30, 2012</td> <td valign="bottom"> </td> </tr> <tr> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center">(in thousands)</td> <td valign="bottom"> </td> </tr>   <tr bgcolor="#cceeff"> <td valign="top"> Balance at January 1, 2012 </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">828</td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr> <td valign="top"> Restructuring charge for severance </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">—  </td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr bgcolor="#cceeff"> <td valign="top"> Severance payments </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(86</td> <td nowrap="nowrap" valign="bottom">) </td> </tr> <tr style="font-size:1px"> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> </tr> <tr> <td valign="top"> Balance at June 30, 2012 </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">742</td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr style="font-size:1px"> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> </tr>  </table>

10. RECENT ACCOUNTING PRONOUNCEMENTS In April 2011, the Financial Accounting Standards Board (“FASB”) issued guidance to achieve common fair value measurement and disclosure requirements between GAAP and International Financial Reporting Standards. This guidance amends current fair value measurement and disclosure guidance to include increased transparency around valuation inputs and investment categorization. The guidance is effective for fiscal years and interim periods beginning after December 15, 2011. The adoption of this new guidance did not have a material impact on the Company’s financial statements.   In June 2011, the FASB issued guidance regarding presentation of other comprehensive income in the financial statements. This guidance eliminated the option under GAAP to present other comprehensive income in the statement of changes in equity. Under the guidance, the Company had the option to present the components of net income and comprehensive income in either one or two consecutive financial statements. The guidance is effective for fiscal years, and interim periods within those years, beginning after December 15, 2011. The Company elected to present the components of net income and comprehensive income in one financial statement and the adoption of this new guidance did not have a material impact on the Company’s financial statements.

Commitments and Contingencies As of the date of this report, the Company is not a party to any material legal proceedings with respect to itself, its subsidiaries, or any of its material properties. In the normal course of business, the Company may from time to time be named as a party to various legal claims, actions and complaints, including matters involving employment, intellectual property, effects from the use of therapeutics utilizing its technology, professional services or others. It is impossible to predict whether any resulting liability would have a material adverse effect on the Company’s financial position, results of operations or cash flows. In May 2012, the Company exercised its option to terminate its lease obligation for its laboratory facility in Bothell, Washington, effective May 2013, decreasing its future commitment by approximately $400,000 in 2013 and $629,000 in 2014.

<table cellspacing="0" cellpadding="0" width="92%" border="0" style="border-collapse:collapse; text-align: left" align="center">  <tr> <td width="55%"> </td> <td valign="bottom" width="7%"> </td> <td> </td> <td> </td> <td> </td> <td valign="bottom" width="7%"> </td> <td> </td> <td> </td> <td> </td> <td valign="bottom" width="7%"> </td> <td> </td> <td> </td> <td> </td> <td valign="bottom" width="7%"> </td> <td> </td> <td> </td> <td> </td> </tr> <tr> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="6" align="center" style="border-bottom:1px solid #000000">Three Months Ended June 30,</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="6" align="center" style="border-bottom:1px solid #000000">Six Months Ended June 30,</td> <td valign="bottom"> </td> </tr> <tr> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">2012</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">2011</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">2012</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">2011</td> <td valign="bottom"> </td> </tr> <tr> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="6" align="center">(in thousands, except per share data)</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="6" align="center">(in thousands, except per share data)</td> <td valign="bottom"> </td> </tr>   <tr bgcolor="#cceeff"> <td valign="top"> Net income (loss) </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">8,038</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">1,279</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">(9,666</td> <td nowrap="nowrap" valign="bottom">) </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">3,112</td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr> <td valign="top"> Weighted-average number of shares of common stock and common stock equivalents outstanding: </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> </tr> <tr bgcolor="#cceeff"> <td valign="top"> Weighted-average number of common shares outstanding for computing basic earnings per share </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">22,624</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">22,348</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">22,624</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">20,558</td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr> <td valign="top"> Dilutive effect of warrants and stock options after application of the treasury stock method* </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">34</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">805</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">—  </td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">1,112</td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr style="font-size:1px"> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> </tr> <tr bgcolor="#cceeff"> <td valign="top"> Weighted-average number of common shares outstanding for computing diluted earnings per share </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">22,658</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">23,153</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">22,624</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">21,670</td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr style="font-size:1px"> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> </tr> <tr> <td valign="top"> Net income (loss) per share — basic </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">0.36</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">0.06</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">(0.43</td> <td nowrap="nowrap" valign="bottom">) </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">0. 15</td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr style="font-size:1px"> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> </tr> <tr bgcolor="#cceeff"> <td valign="top"> Net income (loss) per share — dilutive </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">0.35</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">0.06</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">(0.43</td> <td nowrap="nowrap" valign="bottom">) </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">0.14</td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr style="font-size:1px"> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> </tr>  </table>

The Company’s assets and liabilities measured at fair value on a recurring basis consisted of the following as of the date indicated:   <table cellspacing="0" cellpadding="0" width="92%" border="0" style="border-collapse:collapse; text-align: left" align="center">  <tr> <td width="68%"> </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"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="14" align="center" style="border-bottom:1px solid #000000">    Fair Value Measurement as of June 30, 2012     </td> <td valign="bottom"> </td> </tr> <tr> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">Total</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">Level 1</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">Level 2</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">Level 3</td> <td valign="bottom"> </td> </tr> <tr> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="14" align="center">(in thousands)</td> <td valign="bottom"> </td> </tr>   <tr> <td height="8"> </td> <td height="8" colspan="4"> </td> <td height="8" colspan="4"> </td> <td height="8" colspan="4"> </td> <td height="8" colspan="4"> </td> </tr> <tr bgcolor="#cceeff"> <td valign="top"> Cash and Cash equivalents </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">24,491</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">24,491</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td nowrap="nowrap" valign="bottom">$</td> <td nowrap="nowrap" valign="bottom" align="right">—  </td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td nowrap="nowrap" valign="bottom">$</td> <td nowrap="nowrap" valign="bottom" align="right">—  </td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr style="font-size:1px"> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> </tr> <tr> <td valign="top"> Total assets </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">24,491</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">24,491</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td nowrap="nowrap" valign="bottom">$</td> <td nowrap="nowrap" valign="bottom" align="right">—  </td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td nowrap="nowrap" valign="bottom">$</td> <td nowrap="nowrap" valign="bottom" align="right">—  </td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr style="font-size:1px"> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> </tr>  </table>   <table cellspacing="0" cellpadding="0" width="92%" border="0" style="border-collapse:collapse; text-align: left" align="center">  <tr> <td width="68%"> </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"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="14" align="center" style="border-bottom:1px solid #000000">    Fair Value Measurement as of June 30, 2012     </td> <td valign="bottom"> </td> </tr> <tr> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">Total</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">Level 1</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">Level 2</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">Level 3</td> <td valign="bottom"> </td> </tr> <tr> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="14" align="center">(in thousands)</td> <td valign="bottom"> </td> </tr>   <tr> <td height="8"> </td> <td height="8" colspan="4"> </td> <td height="8" colspan="4"> </td> <td height="8" colspan="4"> </td> <td height="8" colspan="4"> </td> </tr> <tr bgcolor="#cceeff"> <td valign="top"> Warrants* </td> <td valign="bottom"> </td> <td nowrap="nowrap" valign="bottom">$</td> <td nowrap="nowrap" valign="bottom" align="right">2,884</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td nowrap="nowrap" valign="bottom">$</td> <td nowrap="nowrap" valign="bottom" align="right">—  </td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td nowrap="nowrap" valign="bottom">$</td> <td nowrap="nowrap" valign="bottom" align="right">—  </td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td nowrap="nowrap" valign="bottom">$</td> <td nowrap="nowrap" valign="bottom" align="right">2,884</td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr style="font-size:1px"> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> </tr> <tr> <td valign="top"> Total liabilities </td> <td valign="bottom"> </td> <td nowrap="nowrap" valign="bottom">$</td> <td nowrap="nowrap" valign="bottom" align="right">  2,884</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td nowrap="nowrap" valign="bottom">$</td> <td nowrap="nowrap" valign="bottom" align="right">—  </td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td nowrap="nowrap" valign="bottom">$</td> <td nowrap="nowrap" valign="bottom" align="right">—  </td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td nowrap="nowrap" valign="bottom">$</td> <td nowrap="nowrap" valign="bottom" align="right">  2,884</td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr style="font-size:1px"> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> </tr>  </table>   <table cellspacing="0" cellpadding="0" width="92%" border="0" style="border-collapse:collapse; text-align: left" align="center">  <tr> <td width="68%"> </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"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="14" align="center" style="border-bottom:1px solid #000000">Fair Value Measurement as of December 31, 2011</td> <td valign="bottom"> </td> </tr> <tr> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">Total</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">Level 1</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">Level 2</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">Level 3</td> <td valign="bottom"> </td> </tr> <tr> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="14" align="center">(in thousands)</td> <td valign="bottom"> </td> </tr>   <tr> <td height="8"> </td> <td height="8" colspan="4"> </td> <td height="8" colspan="4"> </td> <td height="8" colspan="4"> </td> <td height="8" colspan="4"> </td> </tr> <tr bgcolor="#cceeff"> <td valign="top"> Cash and Cash equivalents </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">39,904</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">39,904</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">—  </td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">—  </td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr style="font-size:1px"> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> </tr> <tr> <td valign="top"> Total assets </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">39,904</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">39,904</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">—  </td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">—  </td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr style="font-size:1px"> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> </tr>  </table>   <table cellspacing="0" cellpadding="0" width="92%" border="0" style="border-collapse:collapse; text-align: left" align="center">  <tr> <td width="68%"> </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"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="14" align="center" style="border-bottom:1px solid #000000">Fair Value Measurement as of December 31, 2011</td> <td valign="bottom"> </td> </tr> <tr> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">Total</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">Level 1</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">Level 2</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">Level 3</td> <td valign="bottom"> </td> </tr> <tr> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="14" align="center">(in thousands)</td> <td valign="bottom"> </td> </tr>   <tr> <td height="8"> </td> <td height="8" colspan="4"> </td> <td height="8" colspan="4"> </td> <td height="8" colspan="4"> </td> <td height="8" colspan="4"> </td> </tr> <tr bgcolor="#cceeff"> <td valign="top"> Warrants* </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">5,446</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">—  </td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">—  </td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">5,446</td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr style="font-size:1px"> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> </tr> <tr> <td valign="top"> Total liabilities </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">  5,446</td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">—  </td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">—  </td> <td nowrap="nowrap" valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">  5,446</td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr style="font-size:1px"> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> </tr>  </table>   <table style="border-collapse:collapse; text-align: left" border="0" cellpadding="0" cellspacing="0" width="100%"> <tr> <td width="2%" valign="top" align="left">*</td> <td align="left" valign="top">See Note 5 —“Warrants” for additional information related to the determination of fair value of the warrants and a reconciliation of changes in fair value. </td> </tr> </table>

Changes in the liability and the balance related to the December 2011 restructuring plan are as follows:   <table cellspacing="0" cellpadding="0" width="76%" border="0" style="border-collapse:collapse; text-align: left" align="center">  <tr> <td width="81%"> </td> <td valign="bottom" width="17%"> </td> <td> </td> <td> </td> <td> </td> </tr> <tr> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center" style="border-bottom:1px solid #000000">Six Months Ending June 30, 2012</td> <td valign="bottom"> </td> </tr> <tr> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" colspan="2" align="center">(in thousands)</td> <td valign="bottom"> </td> </tr>   <tr bgcolor="#cceeff"> <td valign="top"> Balance at January 1, 2012 </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">828</td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr> <td valign="top"> Restructuring charge for severance </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">—  </td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr bgcolor="#cceeff"> <td valign="top"> Severance payments </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(86</td> <td nowrap="nowrap" valign="bottom">) </td> </tr> <tr style="font-size:1px"> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> </tr> <tr> <td valign="top"> Balance at June 30, 2012 </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">742</td> <td nowrap="nowrap" valign="bottom"> </td> </tr> <tr style="font-size:1px"> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> </tr>  </table>

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P5Y4M24D

P5Y6M

P5Y4M24D

P5Y3M18D

0.816

0.809

0.816

0.809

0.825

0.797

0.825

0.797

0.024

0.019

0.024

0.019

0.011

0.008

0.011

0.008

994370

14.31

P3Y9M22D

70000

280

499118

10.16

206408

13578

2417659

2124838

2140566

11.18

11.01

P6Y8M5D

12584

2050432

11.12

P6Y5M19D

1807000

2689000

32377

5.52

6.95

31017000

22500000

0.167

111

5446000

2884000

21670000

23153000

22624000

22658000

21670000

23153000

22624000

22658000

20558000

22348000

22624000