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 June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
Numerator
Net loss	$	(18,413	)	$	(15,461	)	$	(36,233	)	$	(30,223	)
Net loss attributable to common stockholders, basic and diluted	$	(18,413	)	$	(15,461	)	$	(36,233	)	$	(30,223	)
Denominator
Weighted average shares outstanding		37,490,960			31,446,235			36,694,820			31,437,448
Less: weighted average shares subject to repurchase		(50,936	)		(245,462	)		(74,073	)		(286,232	)
Weighted average shares used to compute basic and diluted net loss per share		37,440,024			31,200,773			36,620,747			31,151,216
Net loss per share attributable to common stockholders, basic and diluted	$	(0.49	)	$	(0.50	)	$	(0.99	)	$	(0.97	)

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 June 30,
	2018		2017
RSUs and stock options to purchase common stock		3,904,668		3,332,142
Common stock subject to repurchase		32,361		219,267

As of June 30, 2018, the Company has contributions from plan participants of $213,000 under the 2015 ESPP, which if converted, would be equivalent to 4,952 shares based on 85% of the stock price at the beginning of the offering period. As of June 30, 2017, the Company had contributions from plan participants of $130,000 under the 2015 Employee Stock Purchase Plan, which if converted, would have been equivalent to 11,216 shares based on 85% of the stock price at the beginning of the offering period.