Stock-Based Awards (Tables)

9 Months Ended

Sep. 30, 2022

Stock-Based Awards

Assumptions used to determine fair value of stock options granted

	Nine Months Ended
	September 30,
	2022		2021
Risk-free interest rate	2.07	%	0.90	%
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	2,334,750		14.27
Exercised	(85,672)		1.40			1,115
Forfeited and cancelled	(853,864)		18.70
Outstanding as of September 30, 2022	5,187,664	$	16.11	7.4	$	15,376
Options vested and expected to vest as of September 30, 2022	5,187,664	$	16.11	7.4	$	15,376
Options exercisable as of September 30, 2022	2,307,984	$	17.35	5.2	$	9,345

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	867,707		14.33
Vested	(526,706)		11.55	$	7,839
Forfeited and cancelled	(252,763)		12.30
Outstanding as of September 30, 2022	1,585,184	$	14.09

Stock-based compensation expense

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
(In thousands)	2022		2021		2022		2021
Cost of revenue	$	307	$	206	$	837	$	787
Research and development		1,400		939		2,228		2,969
General and administrative		2,481		2,557		7,161		6,453
Total stock-based compensation expense	$	4,188	$	3,702	$	10,226	$	10,209