Net Loss per Share (Tables)

12 Months Ended

Dec. 31, 2015

Earnings Per Share [Abstract]

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

	Year ended December 31,
	2015		2014		2013
Numerator:
Net loss	$	(84,482)	$	(61,889)	$	(32,497)
Denominator:
Weighted–average shares outstanding		78,867		48,332		13,009
Less: weighted average shares subject to repurchase		(112)		(815)		(3,056)
Weighted–average shares used to compute basic and diluted net
loss per share		78,755		47,517		9,953
Basic and diluted net loss per share	$	(1.07)	$	(1.30)	$	(3.27)

Schedule of Antidilutive Securities Excluded from Net Loss per Share Computation

	As of December 31,
	2015	2014	2013
Convertible preferred stock	—	—	49,446,072
Options to purchase common stock, unvested restricted stock and restricted stock units	19,344,137	17,125,349	15,714,762
Total	19,344,137	17,125,349	65,160,834