3. Net Loss Per Share

We compute net loss per common share by dividing the net loss attributable to common stockholders by the weighted-average number of common shares outstanding during the period without consideration of common stock equivalents. Diluted net loss per share is computed by dividing the net loss attributable to common stockholders by the weighted-average number of common stock equivalents outstanding for the period. The treasury stock method is used to determine the dilutive effect of the Company’s stock option grants. Potentially dilutive securities consisting of stock issuable under options and our 2013 Employee Stock Purchase Plan (ESPP) are not included in the diluted net loss per common share calculation where the inclusion of such shares would have had an antidilutive effect.

Basic and diluted net loss per common share is computed as follows (in thousands except share and per share data):


	Three Months Ended					Six Months Ended
	June 30,					June 30,
	2018			2017		2018		2017
			(As Revised)						(As Revised)
	(in thousands, except share
	and per share data)
Numerator:
Net loss attributable to common stockholders	$	(25,869)		$	(7,725)	$	(55,361)	$	(23,200)
Denominator:
Weighted-average common shares outstanding used in computing basic and diluted net loss		55,678,990			46,767,759		51,738,348		46,683,744
Basic and diluted net loss per common share	$	(0.46)		$	(0.17)	$	(1.07)	$	(0.50)

For each of the three and six months ended June 30, 2018 and 2017 all outstanding potentially dilutive securities have been excluded from the calculation of diluted net loss per common share as the effect of including such securities would have been antidilutive.