Net Loss per Share Attributable to Common Stockholders (Tables)

9 Months Ended

Sep. 30, 2016

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,
	2016			2015			2016			2015
Numerator
Net loss	$	(9,231	)	$	(5,462	)	$	(27,411	)	$	(15,037	)
Cumulative dividends on redeemable convertible    preferred stock		—			(1,900	)		—			(4,530	)
Accretion of redeemable convertible preferred    stock to redemption value		—			(26	)		—			(88	)
Net loss attributable to common stockholders,    basic and diluted	$	(9,231	)	$	(7,388	)	$	(27,411	)	$	(19,655	)
Denominator
Weighted average shares outstanding		27,023,650			3,923,228			27,023,951			3,846,864
Less: weighted average shares subject to    repurchase		(553,352	)		(1,268,863	)		(692,099	)		(1,382,988	)
Weighted average shares used to compute basic    and diluted net loss per share		26,470,298			2,654,365			26,331,852			2,463,876
Net loss per share attributable to common    stockholders: Basic and diluted	$	(0.35	)	$	(2.78	)	$	(1.04	)	$	(7.98	)

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:

	September 30,
	2016		2015
Common stock subject to repurchase		517,219		1,200,946
Stock options to purchase common stock		2,034,777		1,160,264