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Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2023

Stock-Based Compensation [Abstract]

Weighted-Average Assumptions Used for Stock Options Granted

The following weighted-average assumptions were used for stock options granted during the years ended December 31, 2023 and 2022:

		Year ended December 31,
		2023				2022
Weighted average risk-free rate			3.82	%			2.52	%
Weighted average volatility			95.15	%			90.49	%
Dividend yield			0	%			0	%
Expected term		5.44 years				5.79 years

Summarizes of Stock Option Activity

The following table summarizes stock option activity for the years ended December 31, 2023 and 2022 (in thousands except for per-share and remaining contractual life data):

		Outstanding Options				Weighted Average Exercise Price per Share				Weighted Average Remaining Contractual Life (in years)				Aggregate Intrinsic Value
Outstanding January 1, 2022			199			$	168				9.38			$	-
Granted			287				17
Cancelled			(127	)			141
Outstanding December 31, 2022			359				57				7.57				-
Granted			237				4
Cancelled			(207	)			19
Outstanding December 31, 2023			389			$	45				7.04			$	-
Options vested and exercisable at December 31, 2023			331			$	50				6.69			$	-

Summarizes of RSU Activity

The following table summarizes RSU activity for the years ended December 31, 2023 and 2022 (in thousands except for per-share data):

		Outstanding Restricted Stock Units				Weighted Average Fair Value per Share
January 1, 2022			12			$	276
Granted			55				39
Released			(3	)			271
Cancelled			(60	)			61
December 31, 2022			4				236
Cancelled			(3	)			199
December 31, 2023			1			$	322
Balance expected to vest at December 31, 2023			1			$	322

Stock-Based Compensation Expense

For the years ended December 31, 2023 and 2022, the Company recognized stock-based compensation expense as follows (in thousands):

		Years ended December 31,
		2023				2022
Research and development		$	234			$	1,249
General and administrative			1,008				1,686
Total		$	1,242			$	2,935

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Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

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

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