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Significant Accounting Policies - Change in Accounting Policy (Details) - USD ($) $ in Thousands | Jan. 01, 2019 | Dec. 31, 2020 | Apr. 01, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Accounting Changes |  |  |  |
Operating lease right-of-use assets |  | $ 10,275 |  | $ 14,453
Operating lease liability |  | $ 10,453 |  |
ASU 2016-02, Leases |  |  |  |
Accounting Changes |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Adopted | true |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Prior Period Not Restated | true |  |  |
Operating lease right-of-use assets | $ 14,200 |  |  |
Operating lease liability | $ 14,200 |  |  |
ASU 2019-12, Simplifying the Accounting for Income Taxes |  |  |  |
Accounting Changes |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Adopted |  |  | true |

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