Income Taxes (Tables)

12 Months Ended

Dec. 31, 2022

Income Taxes [Abstract]

Components of Net Deferred Tax Assets

The components of the net deferred tax assets are as follows at December 31:

	2022			2021
	(in thousands)
Operating loss carryforwards	$	53,119		$	54,949
Tax credit carryforwards		3,558			3,720
Other temporary differences		9,168			1,652
		65,845			60,321
Less valuation allowance		(65,845	)		(60,321	)
Net deferred tax asset	$	—		$	—

Primary Factors Affecting Income Tax Rates

The primary factors affecting the Company’s income tax rates were as follows:

	2022			2021
Tax benefit at U.S. statutory rates		(21	%)		(21	%)
State tax benefit		4.2	%		(4.7	%)
Permanent differences		0.5	%		0.5	%
Other		(1.4	%)		(0.1	%)
Changes in valuation allowance		17.7	%		25.3	%
		0	%		0	%