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Income Taxes - Additional Information (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jul. 22, 2020 | Sep. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Schedule Of Income Taxes [Line Items] |  |  |  |  |  |
Provision for income taxes |  | $ 144 |  | $ 3 | $ 224 | $ 9,041
Effective tax rate |  | 2.50% |  | 0.20% | 2.70% | (120.40%)
Statutory rate |  |  | 21.00% |  |  |
Increase in assets due to change in tax rates on deferred tax assets | $ 900 |  |  |  |  |
UK |  |  |  |  |  |
Schedule Of Income Taxes [Line Items] |  |  |  |  |  |
Statutory rate | 19.00% |  |  |  |  |

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