Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Components of profit (loss) before provision for income taxes
Domestic	$ (10,287)	$ (13,394)
Foreign	137	184
Net loss from operations before income tax (provision) benefit	(10,150)	(13,210)
Current Tax Benefit:
Federal	0	0
State	0	0
Foreign	0	0
Total current	0	0
Deferred Tax Benefit:
Federal	0	0
State	0	0
Foreign	56	(254)
Total deferred	56	(254)
Total tax provision (benefit)	56	(254)
Deferred Tax Assets:
Net operating loss carryforward	28,425	25,799
Capitalization of research and development expense	938	1,162
Credit carryforwards	2,431	2,332
Capital loss carryover	646	646
Stock compensation	764	915
Lease liability	993	1,141
Other temporary differences	338	303
Total deferred tax assets.	34,535	32,298
Valuation allowance	(33,377)	(30,953)
Net deferred tax assets	1,158	1,345
Deferred Tax Liabilities:
Depreciation	(216)	(246)
Right-of-use asset	(741)	(845)
Net deferred taxes	$ 201	$ 254
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	5.10%	2.00%
Permanent differences	0.20%	(0.40%)
Tax credits	1.70%	0.60%
Canada credit audit adjustment	0.00%	(2.60%)
Foreign rate differential	(0.001)	(0.001)
Non-deductible equity transactions	(2.00%)	(7.50%)
Stock compensation	(2.60%)	(0.90%)
Other	0.00%	(0.70%)
Change in valuation allowance	(23.90%)	(9.50%)
Total	(0.60%)	1.90%