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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) (Parenthetical) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Ownership interest |  |  |  | 49.30%
Gross deferred tax assets, valuation allowance | $ 11,635 | $ 10,350 |  | $ 11,361
Internal Revenue Code [Member] |  |  |  |
Gross deferred tax assets, valuation allowance |  |  | $ 2,400 | $ 29,800

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