Net Loss per Share of Common Stock (Tables)

12 Months Ended

Dec. 31, 2016

Earnings Per Share [Abstract]

Schedule of Antidilutive Potential Common Shares

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

	Years Ended December 31,
	2016		2015		2014
Stock options to purchase common stock		10,048,607		11,312,218		10,480,891
RSUs		323,663		258,878		897,231
Common stock warrants		—		—		90,000