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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Income Tax Disclosure [Abstract] |  |
Deferred tax assets (liabilities), Employee benefits and deferred compensation | $ 1,076 | $ 1,040
Deferred tax assets (liabilities), Investments and asset impairments | 1,818 | 1,818
Deferred tax assets (liabilities), Other temporary differences | (1,002) | (871)
Deferred tax assets (liabilities), Net operating loss and capital loss carryforwards | 15,739 | 15,591
Deferred tax assets, gross | 17,631 | 17,578
Valuation allowance | (17,631) | (17,578)
Net deferred tax assets |  |

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