Net Loss per Share Attributable to Common Stockholders (Tables)

9 Months Ended

Sep. 30, 2017

Earnings Per Share [Abstract]

Computation of Basic and Diluted Net Loss per Share

The following table sets forth the computation of basic and diluted net loss per share attributable to common stockholders (in thousands, except share and per share amounts):

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
Numerator
Net loss	$	(14,173	)	$	(9,231	)	$	(38,557	)	$	(27,411	)
Net loss attributable to common stockholders, basic and diluted	$	(14,173	)	$	(9,231	)	$	(38,557	)	$	(27,411	)
Denominator
Weighted average shares outstanding		33,686,799			27,023,650			32,195,471			27,023,951
Less: weighted average shares subject to repurchase		(161,232	)		(553,352	)		(243,840	)		(692,099	)
Weighted average shares used to compute basic and diluted net    loss per share		33,525,567			26,470,298			31,951,631			26,331,852
Net loss per share attributable to common stockholders, basic    and diluted	$	(0.42	)	$	(0.35	)	$	(1.21	)	$	(1.04	)

Summary of Potentially Dilutive Securities Excluded from Computation of Diluted Net Loss per Share

The following outstanding shares of potentially dilutive securities 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 antidilutive:

	As of September 30,
	2017		2016
Common stock subject to repurchase		127,524		517,219
Stock options to purchase common stock		3,289,677		2,034,777