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Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2024

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Schedule of Activities Under Company's Stock Option Plans

The following table summarizes the Company's stock option activities:

						Options Outstanding
		Number of Shares				Weighted- Average Exercise Price Per Share				Weighted- Average Remaining Contractual Life (years)				Aggregate Intrinsic Value
														(in thousands)
Balances at December 31, 2023			12,949,612			$	7.16
Options granted			2,389,000				1.70
Options exercised			(132,351	)			1.58							$	98.1
Options cancelled/forfeited			(644,200	)			9.87
Balances at December 31, 2024			14,562,061				6.20				5.90			$	-
Options Exercisable—December 31, 2024			10,565,931			$	7.67				5.23			$	-

Total Stock-based Compensation Recognized

Total stock-based compensation recorded related to stock options, TRSUs, PSUs and the ESPP was as follows (in thousands):

		Year Ended December 31,
		2024				2023
Research and development		$	2,716			$	2,921
General and administrative			4,952				5,637
Total stock-based compensation expense		$	7,668			$	8,558

Schedule of Estimated Fair Value of Employee Stock Options and ESPP Using Black-Scholes Valuation Model

The Company estimated the fair value of employee stock options and ESPP using the Black-Scholes valuation model based on the date of grant with the following weighted average assumptions:

	Options							ESPP
	Year Ended December 31,							Year Ended December 31,
	2024			2023				2024			2023
Expected volatility		84.0	%		84.0	%			104	%		70.2	%
Risk-free interest rate		4.0	%		4.2	%			5.0	%		5.4	%
Dividend yield	—			—				—			—
Expected term (in years)		5.6			5.1				0.5			0.5
Weighted average fair value per share	$	1.21		$	1.52			$	0.63		$	0.55

Time based RSUs

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Schedule of Company's TRSU Activities

The following table summarizes the Company's TRSU activities:

		Number of Shares				Weighted- Average Remaining Contractual Life (years)				Aggregate Intrinsic Value (in thousands)				Weighted Average Grant Date Fair Value Per Share
Balance at December 31, 2023			1,400,529											$	2.40
RSUs awarded			1,259,833												1.61
RSUs vested			(733,201	)											2.10
RSUs forfeited			(73,929	)											1.82
Balance at December 31, 2024			1,853,232				1.08			$	1,909			$	2.00

Performance based RSUs

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Schedule of Activities for Company's PSUs

The following table summarizes the Company's PSU activities:

		Number of Shares				Weighted- Average Remaining Contractual Life (years)				Aggregate Intrinsic Value (in thousands)				Weighted Average Grant Date Fair Value Per Share
Balance at December 31, 2023			875,000											$	2.41
PSUs awarded			810,000												1.66
PSUs vested			(115,000	)											1.59
PSUs forfeited			(380,000	)											2.54
Balance at December 31, 2024			1,190,000				1.34			$	1,226			$	1.94

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