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Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Provision for income taxes [Abstract]
Income taxes using U.S federal statutory rate	$ (5,386)	$ (5,073)
Nondeductible interest	39	315
Loss of tax benefit of state net operating loss carryforwards	2,799	(11)
Branch income	229	(238)
State income taxes, net of federal benefit	311	(1,788)
Foreign rate differential	27	(238)
Valuation allowance	2,114	6,281
Derivative charge		595
Stock option expense, exercises and cancellations	446	308
Research and development costs	(375)	(166)
Other	(204)	15
Total	$ 0	$ 0

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