Stock-Based Awards (Tables)

6 Months Ended

Jun. 30, 2024

Stock-Based Awards

Summary of assumptions used to determine fair value of stock options granted

	Six Months Ended
	June 30,
	2024		2023
Risk-free interest rate	3.85	%	3.48	%
Expected term (in years)	6.0		6.2
Expected volatility	81.95	%	77.73	%
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, 2023	6,419,455	$	15.94	7.1	$	14
Granted	1,982,700		1.19
Forfeited and cancelled	(1,820,950)		14.74
Outstanding as of June 30, 2024	6,581,205	$	11.85	7.0	$	23
Options vested and expected to vest as of June 30, 2024	6,581,205	$	11.85	7.0	$	23
Options exercisable as of June 30, 2024	3,525,088	$	15.74	5.3	$	16

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, 2023	1,521,940	$	15.72
Granted	2,638,025		1.20
Vested	(493,254)		13.37	$	587
Forfeited and cancelled	(555,960)		12.54
Outstanding as of June 30, 2024	3,110,751	$	4.35

Summary of stock-based compensation expense

	Three Months Ended				Six Months Ended
	June 30,				June 30,
(In thousands)	2024		2023		2024		2023
Cost of revenue	$	223	$	473	$	475	$	772
Research and development		1,097		3,494		1,068		6,096
General and administrative		1,583		2,555		3,449		6,460
Total stock-based compensation expense	$	2,903	$	6,522	$	4,992	$	13,328