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Stockholders' Equity
 9 Months Ended
Sep. 30, 2014
Equity [Abstract]  
Stockholders' Equity
Stockholders’ Equity

Preferred Stock — The company has authorized up to 5,000,000 shares of preferred stock, $0.0001 par value per share, for issuance. The preferred stock will have such rights, preferences, privileges and restrictions, including voting rights, dividend rights, conversion rights, redemption privileges and liquidation preferences, as shall be determined by the company’s board of directors upon its issuance. To date, the company has not issued any preferred shares.

Common Stock — The company has authorized up to 200,000,000 shares of common stock, $0.0001 par value per share, for 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