Common Stock

12 Months Ended

Dec. 31, 2013

Equity [Abstract]

Common Stock

13. Common Stock

In July 2013, the Company sold an aggregate of 5,750,000 shares of its common stock at a price to the public of $5.00 per share in an underwritten public offering and received net proceeds of approximately $26.7 million, after deducting underwriting discounts and commissions and offering expenses payable by the Company.

During the first quarter of 2012, the Company amended its certificate of incorporation to increase the number of authorized shares of common stock to 200.0 million shares of $0.01 par value common stock. As of December 31, 2013 and 2012, the Company had 200.0 million shares of $0.01 par value common stock authorized. There were approximately 102,523,000 and 95,825,000 shares of common stock issued and outstanding as of December 31, 2013 and 2012, respectively. The shares reserved for future issuance as of December 31, 2013 and 2012 consisted of the following:

(in thousands)	December 31, 2013		December 31, 2012
Common stock warrants		2,777		2,842
Options to purchase common stock		20,107		18,066
Conversion of the Notes		25,000		—