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Stockholders' Equity
 3 Months Ended
Mar. 31, 2016
Stockholders' Equity Note [Abstract]  
Stockholders' Equity
Stockholders’ Equity
The following is a summary of the Company's authorized and issued common and preferred stock as of March 31, 2016 and December 31, 2015:
 
 
 
 
 
Outstanding as of
 
Authorized
 
Issued
 
March 31,
2016
 
December 31, 2015
Common Stock, par $0.001
600,000,000

 
72,268,183

 
72,268,183

 
72,217,965

Series A Preferred Stock, par $0.001
1,000

 
817

 
—

 
—

Series B Preferred Stock, par $0.001
1,000

 
750

 
—

 
—

Series C Preferred Stock, par $0.001
1,091

 
1,091

 
23

 
23

Series D Preferred Stock, par $0.001
1,966,292

 
1,966,292

 
—

 
—


Common Stock
On May 5, 2015, the Company closed an underwritten public offering of 10,925,000 shares of the Company's common stock, including 1,425,000 shares of common stock issued pursuant to the underwriter’s exercise of its overallotment option, at the public offering price of $8.00 per share. The net proceeds, after deducting the underwriter’s discounts and commission and other estimated offering expenses, were approximately $81.9 million.

Warrants
The Company accounts for registered common stock warrants issued in March 2013 under the authoritative guidance on accounting for derivative financial instruments indexed to, and potentially settled in, a company’s own stock, on the understanding that in compliance with applicable securities laws, the registered warrants require the issuance of registered securities upon exercise and do not sufficiently preclude an implied right to net cash settlement. The Company classifies registered warrants on the condensed consolidated balance sheet as a current liability which is revalued at each balance sheet date subsequent to the initial issuance. Determining the appropriate fair-value model and calculating the fair value of registered warrants requires considerable judgment, including estimating stock price volatility and expected warrant life. The Company develops its estimates based on historical data. A small change in the estimates used may have a relatively large change in the estimated valuation. The Company uses the Black-Scholes pricing model to value the registered warrants. Changes in the fair market value of the warrants are reflected in the condensed consolidated statement of operations as “Change in fair value of common stock warrants.”
The following table summarizes the warrants outstanding as of March 31, 2016 and December 31, 2015:
 
 
 
 
 
 
 
As of March 31, 2016
 
As of December 31, 2015
Issued in Connection With:
 
Exercise
Price
 
Expiration
Date
 
Number of
Warrants
 
Common Stock
Warrant Liability
 
Number of
Warrants
 
Common Stock
Warrant Liability
March 2013 financing
 
$
3.17

 
September 12, 2018
 
284,091

 
$
1,707,387

 
284,091

 
$
1,301,138

Warrants assumed in June 2009 Merger
 
$4.08-$5.08

 
April 28, 2016
 
276,813

 
—

 
276,813

 
—

Total
 
 
 
 
 
560,904

 
$
1,707,387

 
560,904

 
$
1,301,138


Stock Options
The Company has one active stock-based incentive plan, the Amended and Restated 2007 Omnibus Incentive Plan (the “Incentive Plan”), pursuant to which the Company has granted stock options and restricted stock awards to executive officers, directors and employees. The Incentive Plan was adopted on March 31, 2007, approved by the stockholders on May 4, 2007, approved by the stockholders as amended on May 2, 2008, and approved by the stockholders as amended and restated on August 25, 2009, May 14, 2010, May 22, 2014 and May 8, 2015. On May 14, 2010 the stockholders approved to increase the aggregate number of shares available for grant under the Incentive Plan by 500,000 and to provide that the aggregate number of shares available for grant under the Incentive Plan will be increased on January 1 of each year beginning in 2011 by a number of shares equal to the lesser of 513,833 or such lesser number of shares as may be determined by the Board. On May 22, 2014 and May 8, 2015, the stockholders approved to increase the aggregate number of shares available for grant under the Incentive Plan by 1,250,000 and 2,000,000, respectively. At March 31, 2016, there were 7,770,497 shares of common stock reserved for issuance upon exercise of incentive awards granted and to be granted at future dates under the Incentive Plan. At March 31, 2016, the Company had 633,988 shares of common stock available for future grant under the Incentive Plan, 732,668 shares of unvested restricted stock units and options to purchase 5,821,784 shares of common stock outstanding under the Incentive Plan. The awards granted and available for future grant under the Incentive Plan generally vest over three years and have a maximum contractual term of ten years. The Incentive Plan terminates by its terms on March 31, 2017.
The Incentive Plan supersedes all of the Company’s previous stock option plans, which include the Amended 2000 Stock Option Plan and the VGX Equity Compensation Plan, under which the Company had options to purchase 106,877 and 1,206,963 shares of common stock outstanding at March 31, 2016, respectively. The terms and conditions of the options outstanding under these plans remain unchanged.