NET LOSS PER SHARE (Tables)

12 Months Ended

Dec. 31, 2016

Earnings Per Share [Abstract]

Schedule of Potential Common Shares Outstanding Excluded from the Computation of Diluted Net Loss Per Share Attributable to Common Stockholders

The following table presents the potential common shares outstanding that 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 (in thousands):

	Years Ended December 31,
	2016	2015	2014
Stock options to purchase common stock	8,981	8,646	8,502
Unvested restricted stock units	906	1,506	1,258
Warrants to purchase common stock	—	111	195
Total	9,887	10,263	9,955