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Stockholders' Equity
 12 Months Ended
Dec. 31, 2013
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. Shares of common stock are reserved as follows:

April 2012 Registered Direct Offering — On April 13, 2012, the company completed an underwritten public offering of 9,751,000 shares of common stock for gross proceeds of approximately $14.6 million, resulting in approximately $13.5 million of net proceeds to the company after deducting the underwriting discounts and commissions and offering expenses.

December 2012 Registered Direct Offering — On December 18, 2012, the company closed an underwritten public offering of 15,156,250 units at a price to the public of $1.60 per unit for gross proceeds of $24.3 million (the “December 2012 Offering”). The offering provided approximately $22.5 million to the company after deducting the underwriting discounts and commissions and offering expenses. Each unit consists of (i) one share of common stock, and (ii) a five-year warrant to purchase 0.50 of a share of common stock at an exercise price of $1.90 per share (subject to anti-dilution adjustment provisions).

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 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 share 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.

Other Equity Transactions — On January 20, 2012, The company sold 579,710 shares of our common stock for $400,000, the fair market value on the date of issuance, to Kwang Dong Pharmaceuticals Company, as part of an existing license agreement for NeuVax covering territorial rights for the compound in South Korea that the company acquired in its merger acquisition with Apthera. During 2013, the company issued a total of 492,988 shares of common stock to the holders of the company's outstanding contingent value rights holders for a milestone payment with a total fair market value of $1,247,000.