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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax assets [Abstract] |  |
Allowances and reserves |  | $ 6
Accrued expenses | $ 128 | 283
Stock based compensation | 168 | 657
Net operating loss carryforwards | 95,114 | 92,659
Income tax credit carryforwards | 8,756 | 8,749
Property and equipment, principally due to differences in depreciation | 16 | 95
Intangible assets | 556 | 370
Other, net | 182 | 217
Deferred tax assets (Total) | 104,920 | 103,036
Valuation allowance | (104,742) | (102,822)
Total deferred tax assets, net of allowance | 178 | 214
Deferred tax liabilities [Abstract] |  |
Other | (178) | (214)
Total deferred tax liability | (178) | (214)
Net deferred tax assets (liability) | $ 0 | $ 0

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