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Income Taxes (Summary of Operating Loss Carryforwards and Tax Credit Carryforwards) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Operating Loss Carryforwards [Line Items] |  |
Net deferred tax asset, net operating loss | $ 16,305 | $ 19,058
Total net deferred tax asset | 20,045 | 22,472
Total valuation allowance | 14,131 | 15,522
State and local jurisdiction |  |
Operating Loss Carryforwards [Line Items] |  |
Net deferred tax asset, net operating loss | 16,531 | 16,624
Valuation allowance, net operating loss | 13,668 | 13,182
Net deferred tax asset, tax credit carryforwards, research |  | 1,198
Net deferred tax asset, alternative minimum tax credit | 1,596 | 2,310
Valuation allowance, tax credit | 0 | 0
Federal tax authority |  |
Operating Loss Carryforwards [Line Items] |  |
Net deferred tax asset, tax credit carryforwards, research | 1,455 |
Valuation allowance, tax credit | 0 |
Foreign tax authority |  |
Operating Loss Carryforwards [Line Items] |  |
Net deferred tax asset, net operating loss |  | 2,340
Valuation allowance, net operating loss |  | $ 2,340
Net deferred tax asset, alternative minimum tax credit | 463 |
Valuation allowance, tax credit | $ 463 |

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