Income Taxes (Details 1) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax liabilities:
Excess tax basis convertible debt	$ (334)
Total deferred tax liabilities	(334)
Deferred tax assets:
Net operating loss carryforwards	21,912	$ 22,560
Inventory and other allowances	14	35
Charitable contribution carryforwards	1	2
Excess (tax) book depreciation	451	524
Excess (tax) book amortization	59	57
Share-based compensation	693	749
Other accrued costs	127	141
Total deferred tax assets	23,257	24,068
Less: Valuation allowance	(22,923)	(24,068)
Deferred income taxes	$ 0	$ 0