Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2024

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Schedule of Weighted Average Grant Fair Value of Stock Options using Black-Scholes Option-pricing Model

The following table presents, on a weighted average basis, the assumptions used in the Black-Scholes option-pricing model to determine the grant-date fair value of stock options granted during the three months ended March 31, 2024 and 2023:

	Three Months Ended March 31,
	2024			2023
Risk-free interest rate		5.0	%	N/A
Expected term (in years)		5.0		N/A
Expected volatility		110.5	%	N/A
Expected dividend yield		0	%	N/A

Schedule of Stock Option Activity

The following table summarizes option activity with service conditions under the 2021 Plan and the 2017 Plan:

	Options			Weighted Average Exercise Price		Weighted Average Contract Term (years)		Aggregate Intrinsic Value
Outstanding at January 1, 2024		2,820,187		$	40.16		5.6	$	—
Granted		451,553			4.32
Exercised		—			—
Forfeited		(48,889	)		22.83
Outstanding at March 31, 2024		3,222,851		$	35.40		5.6	$	2,430
Vested and expected to vest at March 31, 2024		3,222,851		$	35.40		5.6	$	2,430
Exercisable at March 31, 2024		2,052,737		$	46.51		4.1	$	1,620

Schedule of Activity Related to RSU Stock-Based Payment Awards

The following table summarizes activity related to RSU stock-based payment awards:

	Number of Shares			Weighted Average Grant Date Fair Value
Outstanding at January 1, 2024		823,332		$	13.77
Granted		—		$	—
Vested		(233,361	)	$	12.04
Forfeited		(43,706	)	$	13.89
Outstanding at March 31, 2024		546,265		$	14.51

Schedule of Stock-based Compensation Expense

The Company recorded stock-based compensation expense in the following expense categories of its condensed consolidated statements of operations and comprehensive loss:

	Three Months Ended March 31,
	2024		2023
Cost of revenues	$	106	$	164
Research and development		376		558
Selling, general and administrative		2,484		3,266
	$	2,966	$	3,988