Income Taxes (Details 1) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets:
Net operating loss carryforwards	$ 22,560	$ 23,520
Inventory and other allowances	35	12
Charitable contribution carryforwards	2	2
Excess (tax) book depreciation	524	577
Excess (tax) book amortization	57	53
Share-based compensation	749	885
Other accrued costs	141	167
Total deferred tax assets	24,068	25,216
Less: Valuation allowance	$ (24,068)	$ (25,216)