Common Stock

3 Months Ended

Mar. 31, 2012

Common Stock

Common Stock

8.  Common Stock

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. As of December 31, 2011 and March 31, 2012, the Company had 138.5 million shares and 200.0 million shares, respectively, of common stock, $0.01 par value per share, authorized.

There were 11,834,000 and 11,907,000 shares of common stock issued and outstanding as of December 31, 2011 and March 31, 2012, respectively. The shares reserved for future issuance as of December 31, 2011 and March 31, 2012 consisted of the following:

(in thousands)	December  31, 2011	March  31, 2012
Conversion of Series B, Series C, Series D, Series E, Series F and Series G convertible preferred stock	66,256	66,256
Convertible preferred stock warrants	302	302
Common stock warrants	2,640	2,631
1999 Stock Option Plan and 2008 Stock Incentive Plan	17,617	17,515
	86,815	86,704

As discussed in Note 3, in April 2012, the Company closed the initial public offering of its common stock pursuant to a registration statement on Form S-1, as amended. The Company sold an aggregate of 15,042,459 shares of common stock under the registration statement at a public offering price of $7.00 per share, including 742,459 shares pursuant to the exercise by the underwriters of an over-allotment option. Upon closing, all outstanding shares of the Company’s convertible preferred stock were converted into 66,255,529 shares of common stock.