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Income Taxes - Tax Effects of Temporary Differences and Carry-Forwards (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred Tax Assets [Abstract] |  |
Inventory reserve | $ 301,000 | $ 325,000
Fixed assets | 0 | 0
Other reserves and accruals | 207,000 | 133,000
Stock-based compensation | 23,000 | 18,000
Other | 0 | 0
Tax credit carry-forwards | 1,966,000 | 2,284,000
Federal tax loss carry-forwards | 1,980,000 | 2,380,000
State tax loss carry-forwards | 734,000 | 657,000
Foreign tax loss carry-forwards | 127,000 | 173,000
Total deferred income taxes | 5,338,000 | 5,970,000
Valuation allowance | (5,097,000) | (5,627,000)
Net deferred tax assets | 127,000 | 173,000
Deferred Tax Liabilities [Abstract] |  |
Inventory reserve | 0 | 0
Fixed assets | 90,000 | 141,000
Other reserves and accruals | 0 | 0
Stock-based compensation | 0 | 0
Other | 24,000 | 29,000
Total deferred income tax liabilities | $ 114,000 | $ 170,000

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