Income Taxes (Tables)

12 Months Ended

Dec. 31, 2023

Income Tax Disclosure [Abstract]

Income Tax Benefit Attributable to Our Loss from Operations

Income tax benefit attributable to the Company’s loss from operations before income taxes differs from the amounts computed by applying the U.S. federal statutory income tax rate of 21% for 2023 and 2022, as a result of the following (in thousands):

	Years ended December 31,
	2023			2022
U.S. federal income tax benefit at statutory rates	$	(1,121	)	$	(2,085	)
State income tax benefit, net of federal benefit		(192	)		(357	)
Research and experimentation credits		—			—
Deferred tax asset adjustment		47			2
Other		107			186
Change in valuation allowance		1,159			2,254
Income tax benefit	$	—		$	—

Net Deferred Tax Assets and Liabilities

Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting and the amounts used for income tax purposes, as well as operating loss and tax credit carryforwards. The income tax effects of temporary differences and carryforwards that give rise to significant portions of the Company’s net deferred tax assets and liabilities consisted of the following (in thousands):

	As of December 31,
	2023			2022
Deferred tax assets:
Net operating loss carryforwards	$	51,190		$	50,008
Charitable contribution carryforwards		371			393
Research and experimentation credits		2,420			2,420
Capitalized research and development costs		951			979
Capitalized intangibles		354			356
Stock-based compensation		232			205
Accrued compensation		7			6
Lease liabilities		69			94
Total deferred tax assets		55,594			54,461
Valuation allowance		(55,531	)		(54,372	)
Deferred tax assets, net of valuation allowance		63			89
Deferred tax liabilities:
Right-of-use asset		(61	)		(84	)
Depreciation and amortization		(2	)		(5	)
Net deferred tax liability	$	—		$	—