Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Components of profit (loss) before provision for income taxes
Domestic	$ (11,062)	$ (10,287)
Foreign	67	137
Loss from operations before income taxes	(10,995)	(10,150)
Current Tax Provision:
Federal	0	0
State	0	0
Foreign	0	0
Total current	0	0
Deferred Tax Benefit:
Federal	0	0
State	0	0
Foreign	36	56
Total deferred	36	56
Total tax provision	36	56
Deferred Tax Assets:
Net operating loss carryforward	5,533	28,425
Capitalization of research and development expense	0	938
Credit carryforwards	565	2,431
Capital loss carryover	0	646
Stock compensation	886	764
Lease liability	864	993
Other temporary differences	106	338
Total deferred tax assets	7,954	34,535
Valuation allowance	(6,961)	(33,377)
Net deferred tax assets	993	1,158
Deferred Tax Liabilities:
Depreciation	(185)	(216)
Right-of-use asset	(643)	(741)
Net deferred taxes	$ 165	$ 201
Difference between income tax benefit computed at the federal statutory rate and the provision for income taxes
Federal income tax at statutory federal rate	21.00%	21.00%
State taxes	5.90%	5.10%
Permanent differences	(0.20%)	0.20%
Tax credits	2.00%	1.70%
Foreign rate differential	(0.001)	(0.001)
Impact of ownership change	(267.00%)	0.00%
Non-deductible equity transactions	0.00%	(2.00%)
Stock compensation	(2.10%)	(2.60%)
Other	(0.10%)	0.00%
Change in valuation allowance	240.30%	(23.90%)
Total	(0.30%)	(0.60%)