Net Loss per Share Attributable to Common Stockholders (Tables)

3 Months Ended

Mar. 31, 2014

Outstanding Shares of Common Stock Equivalents Excluded from Computation of Diluted Net Loss

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

	Three Months Ended March 31,
	2014		2013
Convertible preferred stock		—		24,026,797
Stock options to purchase common stock		4,202,821		1,653,298
Preferred stock warrants		—		81,075
Common stock warrants		13,873		1,500