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Share-based Compensation (Tables)

3 Months Ended

Mar. 31, 2023

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Non-cash, Share-based Compensation Expense

For the three months ended March 31, 2023 and 2022, the Company recognized the following non-cash, share-based compensation expense in the statements of operations (in thousands):

	Three Months Ended March 31,
	2023				2022
Research and development	$	41			$	41
General and administrative		163				126
Total	$	204			$	167

Summary of Stock Option Activities

Stock option transactions for the three months ended March 31, 2023 and 2022 under the Company’s stock incentive plans were as follows:

		Options Outstanding
		Number of Options				Weighted Average  Exercise Price				Weighted Average Remaining Contractual Term  (in years)
Options outstanding - December 31, 2021			704,960			$	5.62				8.29
Granted			—				—
Exercised			—				—
Forfeited and cancelled			(40,103	)			3.48
Options outstanding - March 31, 2023			664,857			$	5.75				7.53
Options exercisable - March 31, 2023			363,281			$	7.87				6.85
Options vested and expected to vest			664,734			$	5.75				7.53

Summary of Stock Award Transactions under Stock Incentive Plans

Stock award transactions for the three months ended March 31, 2023 under the Company’s stock incentive plans were as follows:

		Restricted Stock Units Outstanding
		Number of Shares				Weighted Average Grant Date Fair Value
RSUs outstanding - December 31, 2022			91,000			$	2.21
Granted			—				—
Vested and released			—				—
Forfeited and cancelled			—				—
RSUs outstanding - March 31, 2023			91,000			$	2.21

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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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Tabular disclosure of the changes in outstanding nonvested restricted stock units.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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-Publisher FASB
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-Section 50
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