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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2023

Income Tax Disclosure [Abstract]

Reconciliation of Total Income Tax Provision

A reconciliation of the total income tax provision tax rate to the statutory federal income tax rates of 21% for the years ended December 31, 2023 and 2022, respectively, is as follows:

			2023				2022
Income tax expense (benefit) at federal statutory rate			(21.0	)%			(21.0	)%
Change in valuation allowance			25.5	%			22.5	%
Income tax expense (benefit) at state statutory rate			(0.2	)%			(0.2	)%
Share based compensation			1.0	%			0.9	%
NOLs expiring and adjustments to NOL			(0.1	)%			0.5	%
Research credit			(5.1	)%			(2.5	)%
Return to provision			(0.1	)%			(0.1	)%
Change in state rate			—				(0.1	)%
			0.0	%			0.0	%

Deferred Tax Assets and Liabilities

The tax effects of temporary differences that give rise to significant portions of our deferred tax assets and deferred tax liabilities as of December 31, 2023 and 2022 are as follows (in thousands):

			2023				2022
Deferred tax assets:
Accrued expenses		$	269			$	262
Share based compensation			99				107
Net operating loss carryforwards			13,397				12,605
Income tax credit carryforwards			1,630				956
Property and equipment, principally due to differences in    depreciation			154				89
Intangible assets			3,527				2,073
Other, net			453				53
			19,529				16,145
Valuation allowance			(19,486	)			(16,092	)
Total deferred tax assets, net of allowance			43				53
Deferred tax liabilities:
Other			(43	)			(53	)
Total deferred tax liability			(43	)			(53	)
Net deferred tax assets (liability)		$	—			$	—

Unrecognized Tax Benefits Activity

Following is a tabular reconciliation of the unrecognized tax benefits activity during the years ended December 31, 2023 and 2022 (in thousands):

			2023				2022
Unrecognized Tax Benefits – Beginning		$	209			$	81
Gross decreases – tax positions in prior period			(16	)			(1	)
Gross increase – current-period tax positions			215				129
Unrecognized Tax Benefits – Ending		$	408			$	209

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Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets.

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Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations.

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Tabular disclosure of the change in unrecognized tax benefits.

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