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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

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