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Income Taxes - Deferred Tax Valuation Allowance (Details) - Valuation Allowance of Deferred Tax Assets - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Valuation Allowance [Line Items] |  |  |
Beginning balance | $ 64,482 | $ 90,366 | $ 59,349
Additions based on changes in deferred tax assets | 25,932 | 2,717 | 25,193
Reductions based on changes in deferred tax assets | (74) | (28,601) |
Increase in valuation allowance due to rate change from Tax Act |  |  | 5,824
Ending balance | $ 90,340 | $ 64,482 | $ 90,366

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