Net Loss per Share

9 Months Ended

Sep. 30, 2011

Net Loss Per Share [Abstract]

Net Loss per Share

4. Net Loss per Share

     The Company calculates basic and diluted net loss per share of common stock by dividing the net loss adjusted for the dividend on the redeemable convertible preferred stock by the weighted average number of shares of common stock outstanding during the period. The Company has excluded (a) all unvested restricted shares that are subject to repurchase and (b) the Company’s other potentially dilutive shares, which include redeemable and convertible preferred stock, a warrant to purchase common or redeemable convertible preferred stock, and outstanding common stock options, from the weighted average number of shares of common stock outstanding as their inclusion in the computation for all periods would be anti-dilutive due to net losses. The Company’s redeemable and convertible preferred stock are participating securities as defined by ASC 260-10, Earnings Per Share, but are excluded from the earnings per share calculation as they do not have an obligation to share in the Company’s net losses.

     The following potentially dilutive shares of common stock have been excluded from the computation of diluted weighted average shares outstanding as they would be anti-dilutive (in thousands):

	For the three and nine months ended September 30,
	2011		2010
Redeemable and convertible preferred stock		—		13,483
Options to purchase common stock		2,055		2,549
Warrants		11		11
Restricted stock		14		32
Total		2,080		16,075