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</LabelSeparator><Level>2</Level><ElementName>us-gaap_SubsequentEventsTextBlock</ElementName><ElementPrefix>us-gaap_</ElementPrefix><IsBaseElement>true</IsBaseElement><BalanceType>na</BalanceType><PeriodType>duration</PeriodType><IsReportTitle>false</IsReportTitle><IsSegmentTitle>false</IsSegmentTitle><IsCalendarTitle>false</IsCalendarTitle><IsEquityPrevioslyReportedAsRow>false</IsEquityPrevioslyReportedAsRow><IsEquityAdjustmentRow>false</IsEquityAdjustmentRow><IsBeginningBalance>false</IsBeginningBalance><IsEndingBalance>false</IsEndingBalance><IsReverseSign>false</IsReverseSign><PreferredLabelRole>terseLabel</PreferredLabelRole><FootnoteIndexer /><Cells><Cell FlagID="0" ContextID="c20130101to20130630" UnitID=""><Id>1</Id><IsNumeric>false</IsNumeric><IsRatio>false</IsRatio><DisplayZeroAsNone>false</DisplayZeroAsNone><NumericAmount>0</NumericAmount><RoundedNumericAmount>0</RoundedNumericAmount><NonNumbericText>&lt;div style="font-family: 'Times New Roman', Times, serif; font-size: 10pt;"&gt;&lt;div style="text-align: left; text-indent: 0pt; display: block; font-family: Times New Roman; margin-left: 0pt; font-size: 10pt; font-weight: bold; margin-right: 0pt;"&gt;9. &amp;#160;SUBSEQUENT EVENTS&lt;/div&gt;&lt;div style="text-indent: 0pt; display: block;"&gt;&lt;br /&gt;&lt;/div&gt;&lt;div style="text-align: justify; text-indent: 36pt; display: block; font-family: Times New Roman; margin-left: 0pt; font-size: 10pt; margin-right: 0pt;"&gt;&lt;div style="text-align: justify; text-indent: 36pt; font-family: ''Times New Roman'', Times, serif; font-size: 10pt;"&gt;On July 3, 2013, the Company and Cowen and Company, LLC entered into an Amended and Restated Sales Agreement to increase the aggregate gross sales proceeds that may be raised pursuant to its ATM offering to $100,000,000, of which approximately $38.3 million was previously sold pursuant to the original Sales Agreement dated April 30, 2012. In connection with the offer and sale of common stock pursuant to the Amended and Restated Sales Agreement, the Company filed an amendment to the Prospectus Supplement, dated July 3, 2013, with the SEC. As of July 18, 2013, an aggregate of approximately $56.5 million remained available for future sales of the Company's common stock under the Amended and Restated Sales Agreement.&lt;/div&gt;&lt;div&gt;&lt;br /&gt;&lt;/div&gt;&lt;div style="text-align: justify; text-indent: 36pt; font-family: ''Times New Roman'', Times, serif; font-size: 10pt;"&gt;&lt;font style="font-family: ''Times New Roman'', Times, serif; font-size: 10pt;"&gt;On July 23, 2013, at the Company's Annual Meeting of Stockholders, the stockholders approved an amendment to the Company's 2010 Stock Incentive Plan (the "2013 Plan Amendment"). The 2013 Plan Amendment was previously approved by the Company's Board of Directors in June 2013. The 2013 Plan Amendment increased the share reserve available for issuance by 3,000,000 under the 2010 Stock Incentive Plan to an aggregate of approximately 11.9 million shares. The 2013 Plan Amendment also adds a fungible share-counting provision stating that restricted stock and restricted stock unit awards will be counted against the reserve of shares available for issuance under the 2010 Stock Incentive Plan as 1.35 shares for every one share actually issued and provides that &lt;/font&gt;shares purchased on the open market with the cash proceeds from exercise of any stock options shall not increase the number of shares available for future issuance under the &lt;font style="font-family: ''Times New Roman'', Times, serif; font-size: 10pt;"&gt;2010 Stock Incentive &lt;/font&gt;Plan. &lt;font style="font-family: ''Times New Roman'', Times, serif; font-size: 10pt;"&gt;In addition, the 2013 Plan Amendment also &lt;/font&gt;provides that the administrator of the stock plan may not cancel an outstanding option whose exercise price is greater than fair market value at the time of cancellation in exchange for cash, without shareholder approval. &lt;font style="font-family: ''Times New Roman'', Times, serif; font-size: 10pt;"&gt;The 2013 Plan Amendment was attached as Annex A to the Company's Definitive Proxy Statement that was filed with the SEC on June 7, 2013.&lt;/font&gt;&lt;/div&gt;&lt;/div&gt;&lt;/div&gt;</NonNumbericText><FootnoteIndexer /><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat></Cell></Cells><ElementDataType>nonnum:textBlockItemType</ElementDataType><SimpleDataType>na</SimpleDataType><ElementDefenition>The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. 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