Stock-Based Awards (Tables)

6 Months Ended

Jun. 30, 2022

Stock-Based Awards

Assumptions used to determine fair value of stock options granted

	Six Months Ended
	June 30,
	2022		2021
Risk-free interest rate	1.90	%	0.91	%
Expected term (in years)	6.2		6.2
Expected volatility	77.95	%	76.60	%
Expected dividend yield	0	%	0	%

Summary of stock option activity

				Weighted
		Weighted		Average
		Average		Remaining	Aggregate
	Number	Exercise		Contractual	Intrinsic
(In thousands, except share and per share data and years)	of Shares	Price		Term	Value
				(in years)
Outstanding as of December 31, 2021	3,792,450	$	17.50	6.8	$	13,710
Granted	1,891,950		14.40
Exercised	(85,672)		1.40			1,115
Forfeited and cancelled	(583,775)		15.70
Outstanding as of June 30, 2022	5,014,953	$	16.81	7.1	$	10,817
Options vested and expected to vest as of June 30, 2022	5,014,953	$	16.81	7.1	$	10,817
Options exercisable as of June 30, 2022	2,519,499	$	18.26	4.8	$	7,784

Summary of restricted stock units activity

		Weighted
		Average
		Grant Date		Aggregate
	Number	Fair Value		Intrinsic
(In thousands, except share and per share data)	of Shares	Per Share		Value
Outstanding as of December 31, 2021	1,496,946	$	12.75
Granted	720,134		14.44
Vested	(513,958)		11.55	$	7,645
Forfeited and cancelled	(245,813)		12.17
Outstanding as of June 30, 2022	1,457,309	$	14.11

Stock-based compensation expense

	Three Months Ended				Six Months Ended
	June 30,				June 30,
(In thousands)	2022		2021		2022		2021
Cost of revenue	$	302	$	335	$	530	$	582
Research and development		941		1,154		828		2,030
General and administrative		2,449		2,343		4,680		3,895
Total stock-based compensation expense	$	3,692	$	3,832	$	6,038	$	6,507