Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2018

Accounting Policies [Abstract]

Schedule of Earnings Per Share, Basic and Diluted

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 data):

	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
	(unaudited)						(unaudited)
Numerator:
Net loss attributable to common stockholders, basic    and diluted	$	(12,847	)	$	(8,172	)	$	(33,852	)	$	(19,800	)
Denominator:
Weighted-average common shares outstanding		23,063,757			5,283,282			21,269,957			5,281,144
Less: weighted-average common shares subject to    repurchase		(85,964	)		(167,117	)		(105,888	)		(187,726	)
Weighted-average common shares used to compute basic    and diluted net loss per share		22,977,793			5,116,165			21,164,069			5,093,418
Net loss per share attributable to common stockholders
Basic and diluted	$	(0.56	)	$	(1.60	)	$	(1.60	)	$	(3.89	)

Schedule of Antidilutive Securities Excluded from Computation of Earnings 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,
	2018		2017
	(unaudited)
Stock options outstanding		3,050,067		2,152,906
Outstanding common stock subject to repurchase		79,351		160,246
Shares issuable related to ESPP		59,735		—
Convertible preferred stock issuable upon conversion to common stock		—		9,629,405
Total		3,189,153		11,942,557