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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)

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