Net Loss per Share Attributable to Common Stockholders (Tables)

3 Months Ended

Mar. 31, 2016

Earnings Per Share [Abstract]

Common Stock Equivalent Shares Excluded from Computation of Diluted Net Loss

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