Income Taxes, Income Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Components of pretax income (loss) and difference between income taxes computed at statutory federal rate and provision for income taxes [Abstract]
Income (loss) before income taxes	$ (5,207)	$ (5,632)
Tax expense (benefit) [Abstract]
Tax at statutory federal rate	(1,094)	(1,182)
State income taxes	(445)	(1,511)
Permanent items, tax credits and other adjustments	0	(30)
Deferred true-ups	0	0
Change in valuation allowance	1,540	2,695
Income tax expense (benefit)	$ 1	$ (28)