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Stock Based Compensation Plan (Tables)

12 Months Ended

Dec. 31, 2022

Share-Based Payment Arrangement [Abstract]

Summary of stock option activity

A summary of option activity is set forth below (shares in thousands):

		Options Outstanding
		Number of Options				Weighted Average Exercise Price				Average Remaining Contractual Life (In years)				Aggregate Intrinsic Value (In thousands)
Outstanding – December 31, 2021			1,794			$	6.31				8.43
Granted			2,198				3.26
Forfeited			(79	)			6.13
Expired			(17	)			6.77
Outstanding – December 31, 2022			3,896				2.43				8.44			$	—
Exercisable – December 31, 2022			1,430				1.94				7.48				—

Summary of RSA Activity

The following table summarizes the Company’s RSA activity (shares in thousands):

		Number of Shares				Weighted Average Grant Date Fair Value
RSAs, unvested at December 31, 2021			161			$	9.39
Vested			(56	)			8.72
RSAs, unvested at December 31, 2022			105				9.74

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

The fair value of options is estimated at the grant date using the Black-Scholes option pricing model with the following weighted-average assumptions:

		Year Ended December 31,
		2022				2021
Expected term (in years)			6.00				6.01
Expected volatility			81.07	%			71.23	%
Risk-free rate			2.03	%			0.89	%
Dividend yield			—				—

Schedule of Stock-Based Compensation Expense

Total stock-based compensation recorded in the consolidated statements of operations and comprehensive loss related to options and RSAs was as follows (in thousands):

		Year Ended December 31,
		2022				2021
Research and development		$	1,612			$	736
General and administrative			2,905				1,580
Total stock-based compensation expense		$	4,517			$	2,316

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Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit.

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-Name Accounting Standards Codification
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Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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