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Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2014
Equity [Abstract] |
Common Stock are Reserved for Future Issuance | September 2013 Underwritten Public Offering - On September 18, 2013 the company closed an underwritten public offering of 17,500,000 units at a price to the public of $2.00 per unit for gross proceeds of $35 million (the "September 2013 Offering"). Each unit consists of one share of common stock, and a warrant to purchase 0.35 of a share of common stock at an exercise price of $2.50 per share. The September 2013 Offering included an over-allotment option for the underwriters to purchase an additional 2,625,000 shares of common stock and/or warrants up to 918,750 shares of common stock. On September 23, 2013, the underwriters exercised their over-allotment option in full. The additional gross proceeds to the company as a result of the full exercise of the over-allotment option were approximately $5.2 million. The total net proceeds of the September 2013 offering, including the exercise of the over-allotment option, were $37.5 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, 2014
Warrants outstanding | 8,540 |
Stock options outstanding | 8,994 |
Options reserved for future issuance under the Company’s 2007 Incentive Plan | 2,484 |
Shares reserved for future issuance under the Employee Stock Purchase Plan | 642 |
Total reserved for future issuance | 20,660 |

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