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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred tax assets [Abstract] |  |
Allowances and reserves | $ 270 | $ 140
Accrued expenses | 122 | 154
Stock based compensation | 996 | 1,065
Net operating loss carryforwards | 91,197 | 87,426
Income tax credit carryforwards | 8,671 | 8,587
Property and equipment, principally due to differences in depreciation | 548 | 514
Other, net | 38 | 45
Deferred tax assets (Total) | 101,842 | 97,931
Valuation allowance | (101,091) | (97,089)
Total deferred tax assets, net of allowance | 751 | 842
Deferred tax liabilities [Abstract] |  |
Intangibles assets | (751) | (842)
Total deferred tax liability | (751) | (842)
Net deferred tax assets (liability) | $ 0 | $ 0

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