9. Net Loss per Share Attributable to Common Stockholders

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 March 31,
	2018			2017
				As Revised (Note 2)
Numerator:
Net loss	$	(17,820	)	$	(14,762	)
Net loss attributable to common stockholders, basic and diluted	$	(17,820	)	$	(14,762	)
Denominator:
Weighted average shares outstanding		35,889,835			31,428,564
Less: weighted average shares subject to repurchase		(62,600	)		(339,254	)
Weighted average shares used to compute basic and diluted net loss per share		35,827,235			31,089,310
Net loss per share attributable to common stockholders, basic and diluted	$	(0.50	)	$	(0.47	)

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 March 31,
	2018		2017
Common stock subject to repurchase		51,767		298,915
Stock options to purchase common stock		3,793,364		3,183,304

As of March 31, 2018, the Company has contributions from plan participants of $367,000 under the 2015 ESPP, which if converted, would be equivalent to 11,066 shares based on 85% of the stock price at the beginning of the offering period. As of March 31, 2017, the Company had contributions from plan participants of $338,400 under the 2015 Employee Stock Purchase Plan, which if converted, would have been equivalent to 29,381 shares based on 85% of the stock price at the beginning of the offering period.