12. Net Loss Per Share

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


		Year Ended December 31,
	2017			2016		2015
Numerator:
Net loss	$		(21,100)	$	(16,708)	$	(18,183)
Denominator:
Weighted-average common shares outstanding			12,640,094		5,117,226		3,013,743
Less: weighted-average unvested common shares subjected to repurchase			(155,110)		(378,730)		(461,538)
Weighted-average common shares outstanding used to calculate net loss per common share, basic and diluted			12,484,984		4,738,496		2,552,205
Net loss per common share, basic and diluted	$		(1.69)	$	(3.53)	$	(7.12)

The following outstanding shares of potentially dilutive securities have been excluded from diluted net loss per common share for the periods presented, because their inclusion would be anti-dilutive:


	Year Ended December 31,
	2017	2016	2015
Redeemable convertible preferred stock on an as-converted basis	—	—	2,486,199
Options to purchase common stock	1,593,195	1,414,730	927,175
Restricted stock units	30,680	—	—
Common stock subject to repurchase	96,153	211,538	461,538
Redeemable convertible preferred stock warrants on an as-converted basis	—	—	27,690
Common stock warrants	27,690	27,690	—
Total	1,747,718	1,653,958	3,902,602