Income Taxes (Details 1) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred tax liabilities:
Excess tax basis convertible debt	$ (257)	$ (334)
Total deferred tax liabilities	(257)	(334)
Deferred tax assets:
Net operating loss carryforwards	15,597	21,912
Inventory and other allowances	23	14
Charitable contribution & other carryforwards	9	1
Excess (tax) book depreciation	375	451
Excess (tax) book amortization	61	59
Share-based compensation	624	693
Other accrued costs	138	127
Total deferred tax assets	16,827	23,257
Less: Valuation allowance	(16,570)	(22,923)
Deferred income taxes	$ 0	$ 0