13. 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.

The following table provides the basic and diluted net loss per share computations for the three months ended March 31, 2019 and 2018.


	Three months ended
	March 31,
(in thousands, except per share data)	2019		2018
Numerator:
Net loss, basic and diluted	$	(34,091)	$	(32,873)

Denominator:
Weighted-average number of shares used in computing net loss per share, basic and diluted		62,831		54,132

Net loss per share, basic	$	(0.54)	$	(0.61)
Net loss per share, diluted	$	(0.54)	$	(0.61)

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 March 31, 2019 and 2018:


	March 31,
	2019	2018
	(in thousands)
Options to purchase common stock	9,533	10,732
Warrants to purchase common stock	—	377
Restricted stock units	2,086	1,014
Employee stock purchase plan	99	181
	11,718	12,304