Net Loss Per Share

9 Months Ended

Sep. 30, 2019

14. Net Loss Per Share

Basic and diluted net loss per share attributable to common stockholders was calculated as follows (in thousands, except share and per share amounts):

	Three Months Ended September 30,						Nine Months Ended September 30,
	2019			2018			2019			2018
Numerator:
Net loss	$	(21,149	)	$	(15,938	)	$	(61,342	)	$	(39,981	)
Net loss attributable to common stockholders	$	(21,149	)	$	(15,938	)	$	(61,342	)	$	(39,981	)

Denominator:
Weighted average common shares outstanding, basic and diluted		25,829,105			19,619,239			25,814,593			7,332,052

Net loss per share attributable to common stockholders, basic and diluted	$	(0.82	)	$	(0.81	)	$	(2.38	)	$	(5.45	)

The Company’s potential dilutive securities have been excluded from the computation of diluted net loss per share as the effect would be to reduce the net loss per share. Therefore, the weighted average number of common shares outstanding used to calculate both basic and diluted net loss per share attributable to common stockholders is the same. The Company excluded the following potential common shares, presented based on amounts outstanding at each period end, from the computation of diluted net loss per share attributable to common stockholders for the periods indicated because including them would have had an anti-dilutive effect:

	September 30,
	2019		2018
Warrants for the purchase of common stock		95,930		95,930
Options to purchase common stock		4,873,097		3,642,747
		4,969,027		3,738,677