Net Loss per Share (Tables)

12 Months Ended

Dec. 31, 2016

Net Loss Per Share [Abstract]

Schedule of Basic and Diluted Net Loss per Share (in thousands, except per share data)

The following table sets forth the computation of basic and diluted net loss per share for 2016, 2015 and 2014 (in thousands, except per share data):

	Year ended December 31,
	2016		2015		2014
Numerator:
Net loss	$	(67,180)	$	(84,482)	$	(61,889)
Denominator:
Weighted–average shares outstanding		85,853		78,867		48,332
Less: weighted average shares subject to repurchase		(8)		(112)		(815)
Weighted–average shares used to compute basic and diluted net loss per share		85,845		78,755		47,517
Basic and diluted net loss per share	$	(0.78)	$	(1.07)	$	(1.30)

Schedule of Antidilutive Securities Excluded from Net Loss per Share Computation

	December 31,
	2016	2015	2014
Options to purchase common stock and unvested restricted stock and restricted stock units	20,313,438	19,344,137	17,125,349