Stock Based Compensation (Tables)

12 Months Ended

Dec. 31, 2023

Share-Based Payment Arrangement [Abstract]

Schedule of Fair Values of Stock Options Granted Using Black-Scholes Option-Pricing Model

The fair values of stock options granted were calculated using the Black-Scholes option-pricing model applying the following assumptions:

	Year Ended December 31,
	2023		2022
Risk-free interest rate	3.27% - 4.48%		1.86% - 3.56%
Expected term (in years)	5.31 - 6.16		5.19 - 6.11
Dividend yield		—		—
Expected volatility	103% - 129%		103% - 128%

Schedule of Share-Based Compensation Expense

The Company recognized stock-based compensation expense in the Consolidated Statements of Operations as follows (in thousands):

	Year Ended December 31,
	2023		2022
General and administrative	$	3,038	$	4,395
Research and development		1,583		2,393
Total stock-based compensation expense	$	4,621	$	6,788

Schedule of Option Activity for Share-Based Payment Arrangement

The following table shows a summary of all stock option activity for the year ended December 31, 2023:

	Number of Underlying Shares			Weighted- Average Exercise Price Per Share		Weighted- Average Contractual Life Remaining in Years		Aggregate Intrinsic Value
Outstanding as of January 1, 2023		13,906,358		$	2.35				—
Granted		6,828,600			0.82
Forfeited		(3,223,874	)		0.92
Exercised		—			—
Expired		(4,739	)		836.63
Outstanding as of December 31, 2023		17,506,345		$	1.79		7.34	$	554,525
Exercisable as of December 31, 2023		14,568,342		$	1.97		6.99	$	233,076
Vested and expected to vest		17,506,345		$	1.79		7.34	$	554,525