Net Loss per Share (Tables)

9 Months Ended

Sep. 30, 2020

Summary of Basic and Diluted Net Loss per Share Attributable to Common Stockholders

Basic and diluted net loss per share attributable to common stockholders was calculated as follow:


	Three Months Ended September 30,				Nine Months Ended September 30,
(in thousands, except per share data)	2020		2019		2020		2019
Numerator:
Net loss	$	(17,449)	$	(17,714)	$	(43,731)	$	(41,970)
Accruing dividends on Series A convertible preferred stock	—		—		—		(592)
Net loss attributable to common stockholders	$	(17,449)	$	(17,714)	$	(43,731)	$	(42,562)
Denominator:
Weighted average common shares outstanding—basic and diluted	20,085		14,562		20,035		9,866
Net loss per share attributable to common stockholders— basic and diluted	$	(0.87)	$	(1.22)	$	(2.18)	$	(4.31)

Schedule of Anti-dilutive Securities Excluded from Computation of Diluted Net Loss per Share Attributable to Common Stockholders

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:


	Three Months Ended September 30,		Nine Months Ended September 30,
	2020	2019	2020	2019
Options to purchase common stock	1,613,024	1,271,141	1,613,024	1,271,141
Unvested restricted stock units	611,994	116,689	611,994	116,689
Warrants to purchase common stock (excluding prefunded warrants, which are included in basic shares outstanding)	9,626,040	4,360,204	9,626,040	4,360,204
	11,851,058	5,748,034	11,851,058	5,748,034