Net Loss per Share Attributable to Common Stockholders

3 Months Ended

Mar. 31, 2016

Net Loss per Share Attributable to Common Stockholders

9. 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 stock 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 March 31,
	2016		2015
Stock options to purchase Common Stock		5,615,484		4,787,869
Common stock warrants		1,500		1,500
Restricted stock units		318,228		171,787
Performance stock units		293,694		140,000