12. Net Loss per Share

Basic net loss per share is computed by dividing the net loss attributable to common stockholders by the weighted-average number of common shares outstanding for the period, excluding shares subject to repurchase and without consideration of potentially dilutive securities. Diluted net loss per share is computed by giving effect to all potentially dilutive common shares outstanding for the period. For purposes of this computation, outstanding common stock options, restricted stock units and warrants are considered to be common share equivalents. Common share equivalents are excluded from the computation in periods in which they have an anti-dilutive effect, unless the consideration of any one of them gives a dilutive effect.

For the three and six months ended June 30, 2017, the warrants were excluded from the computation of diluted net loss per share as the change in its fair value and assumed exercises yielded an anti-dilutive effect. Other potentially dilutive common share equivalents such as outstanding common stock options and restricted stock were not included in the computation of diluted net loss per share for all periods as they also gave an anti-dilutive effect, which represents a reduction of the net loss per share.

The following table provides the basic and diluted net loss per share computations for the three and six months ended June 30, 2018 and 2017.


	Three months ended				Six months ended
	June 30,				June 30,
(in thousands, except per share data)	2018		2017		2018		2017
			(As Revised)				(As Revised)
Numerator:
Net loss, basic and diluted	$	(33,824)	$	(29,066)	$	(66,697)	$	(62,546)

Denominator:
Weighted-average number of shares used in computing net loss per share, basic and diluted		54,551		53,088		54,342		52,924

Net loss per share, basic	$	(0.62)	$	(0.55)	$	(1.23)	$	(1.18)
Net loss per share, diluted	$	(0.62)	$	(0.55)	$	(1.23)	$	(1.18)

The following table shows total outstanding potentially dilutive shares excluded from the computation of diluted loss per share as their effect would be anti-dilutive, as of June 30, 2018 and 2017:


	June 30,
	2018	2017
	(in thousands)
Options to purchase common stock	10,255	9,951
Warrants to purchase common stock	—	377
Restricted stock units	1,025	383
Employee stock purchase plan	70	86
	11,350	10,797