Net loss per share

9 Months Ended

Sep. 30, 2019

Net loss per share

Net loss per share

8.         Net loss per share

Basic and diluted net loss per share attributable to common stockholders was calculated as follows for the three and nine months ended September 30, 2019 and 2018 (in thousands, except per share data):

	Three months ended				Nine months ended
	September 30,				September 30,
	2019		2018		2019		2018
Numerator:
Net loss attributable to common stockholders	$	(14,790)	$	(14,181)	$	(43,632)	$	(39,188)
Denominator:
Weighted-average common shares outstanding—basic and diluted		33,646		33,191		33,510		15,789
Net loss per share attributable to common stockholders—basic and diluted	$	(0.44)	$	(0.43)	$	(1.30)	$	(2.48)

The following common stock equivalents outstanding as of September 30, 2019 and 2018, 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 anti‑dilutive (in thousands):

	As of
	September 30,
	2019	2018
Stock options issued and outstanding	4,958	3,937
Unvested restricted stock	1,159	268
Total	6,117	4,205