Schedule of Deferred Tax Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets
Reserves	$ 634	$ 647
Net operating loss carryforwards	90,593	83,289
R&D credit carryforwards	8,984	8,836
Depreciation/amortization deferred	17,417	15,862
Other	6,701	5,676
Total deferred tax assets	125,551	114,606
Deferred tax liabilities
Operating lease right-of-use assets	(1,171)	(199)
Total deferred tax liabilites	(1,171)	(199)
Net valuation allowances	(124,380)	(114,407)
Deferred tax assets