Income Taxes, Components of Net Deferred Tax Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Deferred Tax Assets [Abstract]
Operating loss carryforwards	$ 53,119	$ 54,949
Tax credit carryforwards	3,558	3,720
Other temporary differences	9,168	1,652
Deferred tax assets, gross	65,845	60,321
Less valuation allowance	(65,845)	(60,321)
Net deferred tax asset	$ 0	$ 0