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Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2015
Equity [Abstract] |
Common Stock are Reserved for Future Issuance | March 2015 Underwritten Public Offering - On March 18, 2015 the company closed an underwritten public offering of 24,358,974 units at a price to the public of $1.56 per unit for gross proceeds of $38 million (the "March 2015 Offering"). Each unit consists of one share of common stock, and a warrant to purchase 0.50 of a share of common stock at an exercise price of $2.08 per share. The March 2015 Offering included an over-allotment option for the underwriters to purchase an additional 3,653,846 shares of common stock and/or warrants to purchase up to 1,826,923 shares of common stock. On March 18, 2015, the underwriters exercised their over-allotment option to purchase warrants to purchase an aggregate of 1,826,923 shares of common stock. On April 10, 2015, the underwriters exercised their over-allotment option to purchase 3,653,846 shares of common stock for additional net proceeds of $5.4 million. The total net proceeds of the March 2015 Offering, including the exercise of the over-allotment option to purchase the warrants, were $40.8 million, after deducting underwriting discounts and commissions and offering expenses payable by the company. Shares of common stock for future issuance are reserved for as follows (in thousands):
| As of September 30, 2015
Warrants outstanding | 22,308 |
Stock options outstanding | 11,188 |
Options reserved for future issuance under the Company’s 2007 Incentive Plan | 10,251 |
Shares reserved for future issuance under the Employee Stock Purchase Plan | 528 |
Total reserved for future issuance | 44,275 |

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