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Income Taxes (Details 1) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforwards | $ 31,935 | $ 31,590
Inventory and other allowances | 16 | 28
Charitable contribution carryforwards | 5 | 6
Excess (tax) book depreciation | 805 | 709
Excess (tax) book amortization | 69 | 67
Share-based compensation | 1,328 | 1,396
Other accrued costs | 219 | 225
Total deferred tax assets | 34,377 | 34,021
Less: Valuation allowance | $ (34,377) | $ (34,021)

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