Net Loss per Share (Tables)

9 Months Ended

Sep. 30, 2021

Earnings Per Share [Abstract]

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)	2021		2020		2021		2020
Numerator:
Net loss	$	(20,175)	$	(17,449)	$	(58,489)	$	(43,731)
Deemed dividend as a result of Class B warrant price reset (Note 10)	—		—		(8,239)		—
Net loss attributable to common stockholders	$	(20,175)	$	(17,449)	$	(66,728)	$	(43,731)
Denominator:
Weighted average shares of common stock outstanding—basic and diluted	26,609		20,085		24,667		20,035
Net loss per share attributable to common stockholders— basic and diluted	$	(0.76)	$	(0.87)	$	(2.71)	$	(2.18)

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

The Company excluded the following potential shares of common stock, 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,
	2021	2020	2021	2020
Options to purchase shares of common stock	1,952,891	1,613,024	1,952,891	1,613,024
Unvested restricted stock units	906,873	611,994	906,873	611,994
Warrants to purchase shares of common stock (excluding prefunded warrants, which are included in basic shares outstanding)	9,449,128	9,626,040	9,449,128	9,626,040
	12,308,892	11,851,058	12,308,892	11,851,058