Net Loss per Share

9 Months Ended

Sep. 30, 2012

Net Loss per Share [Abstract]

Net Loss per Share

11. Net Loss per Share

The following outstanding shares of common stock and potential common shares were excluded from the computation of diluted net loss per share of common stock for the periods presented because including them would have been antidilutive:

	For the three months and nine months ended September 30,
	2012		2011
Convertible preferred stock		—		10,761,524
Stock options to purchase common stock		2,213,529		2,944,899
Restricted stock units for common stock		380,393		—
Restricted shares of common stock subject to repurchase		579,708		1,011,878
Common stock warrants		8,333		—
Convertible preferred stock warrants		—		19,999