Net Loss per Share Attributable to Common Stockholders

6 Months Ended

Jun. 30, 2016

Earnings Per Share [Abstract]

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 June 30,				Six Months Ended June 30,
	2016		2015		2016		2015
Stock options to purchase common stock		5,969,370		4,796,918		5,969,370		4,796,918
Performance stock options		271,122		—		271,122		—
Common stock warrants		1,500		1,500		1,500		1,500
Restricted stock units		585,989		173,575		585,989		173,575
Performance stock units		290,756		165,000		290,756		165,000
Employee stock purchase plan		25,457		9,492		25,457		9,492