Net Loss per Share Attributable to Common Stockholders

9 Months Ended

Sep. 30, 2014

Equity [Abstract]

Net Loss per Share Attributable to Common Stockholders

10. Net Loss per Share Attributable to Common Stockholders

Basic net loss per share attributable to common stockholders has been computed by dividing the net loss by the weighted-average number of shares of common stock outstanding during the period. Diluted net loss per share attributable to common stockholders is calculated by dividing net loss by the weighted average number of shares of common stock and potential dilutive securities outstanding during the period.

The following common equivalent shares 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 anti-dilutive:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2014		2013		2014		2013
Stock options to purchase common stock		4,159,895		3,780,358		4,159,895		3,780,358
Common stock warrants		6,240		82,575		6,240		82,575