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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax assets [Abstract] |  |
Allowances and reserves | $ 6 | $ 270
Accrued expenses | 283 | 122
Stock based compensation | 657 | 996
Net operating loss carryforwards | 92,659 | 91,197
Income tax credit carryforwards | 8,749 | 8,671
Property and equipment, principally due to differences in depreciation | 95 | 548
Intangible assets | 370 |
Other, net | 217 | 38
Deferred tax assets (Total) | 103,036 | 101,842
Valuation allowance | (102,822) | (101,091)
Total deferred tax assets, net of allowance | 214 | 751
Deferred tax liabilities [Abstract] |  |
Other | (214) | (751)
Total deferred tax liability | (214) | (751)
Net deferred tax assets (liability) | $ 0 | $ 0

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