Common Stock

9 Months Ended

Sep. 30, 2011

Common Stock [Abstract]

Common Stock

13. COMMON STOCK

Initial Public Offering — On June 2, 2011, the Company completed its initial public offering issuing 12,021,250 shares of common stock at an offering price of $18.00 per share, resulting in net proceeds to the Company of $201.2 million, after deducting underwriting discounts and commissions of $15.1 million. Additionally, the Company incurred offering costs of $4.2 million related to the initial public offering. Upon the closing of the initial public offering, the Company's outstanding shares of redeemable convertible preferred stock were automatically converted into 34,534,125 shares of common stock and the outstanding Series B redeemable convertible preferred stock warrants were automatically converted into 303,855 shares of common stock.

Common Stock —As of December 31, 2010, under the Company's Certificate of Incorporation, as amended, the Company was authorized to issue 60 million shares of common stock with a par value of $0.001 per share. In connection with the closing of the initial public offering, on June 2, 2011, the Company amended and restated its certificate of incorporation to increase its authorized number of shares of common stock to 150 million and authorize the issuance of 5 million shares of preferred stock. The holder of each share of common stock is entitled to one vote. The board of directors has the authority, without action by its stockholders, to designate and issue shares of preferred stock in one or more series and to fix the rights, preferences, privileges and restrictions thereof. The Company's amended and restated certificate of incorporation provides that the Company's board of directors will be divided into three classes, with staggered three-year terms and provides that all stockholder actions must be effected at a duly called meeting of the stockholders and not by consent in writing. The amended and restated certificate of incorporation also provides that only the board of directors may call a special meeting of the stockholders and requires a 66 2/3% stockholder vote for the adoption, amendment or repeal of any provision of the Company's amended and restated bylaws and for the amendment or repeal of certain provisions of the Company's amended and restated certificate of incorporation.

Common Shares Reserved — The Company had reserved shares of common stock for future issuance as follows:

	September 30, 2011		December 31, 2010
Common shares reserved for:
Conversion of outstanding redeemable convertible preferred stock		—		34,534,125
Options outstanding under the Company's equity incentive plan		7,508,555		5,538,004
Options available for grant under the Company's equity incentive plan		6,100,486		1,083,930
Restricted stock awards		28,042		28,750
Restricted stock units		200,000		—
Preferred stock warrants		—		386,012
Common stock warrant		1,000,000		5,000
		14,837,083		41,575,821