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Other Assets - Additional Information (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2031 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Schedule of Other Assets [Line Items] |  |  |  |  |  |
Prepaid expenses, net of current portion |  | $ 20,606 |  | $ 20,606 |  | $ 22,418
Capital contributions |  | $ 327 | $ 75 | $ 589 | $ 368 |
Minimum |  |  |  |  |  |
Schedule of Other Assets [Line Items] |  |  |  |  |  |
Ownership percentage |  | 3.00% |  | 3.00% |  |
Maximum |  |  |  |  |  |
Schedule of Other Assets [Line Items] |  |  |  |  |  |
Ownership percentage |  | 5.00% |  | 5.00% |  |
Scenario, Forecast |  |  |  |  |  |
Schedule of Other Assets [Line Items] |  |  |  |  |  |
Capital contributions | $ 3,200 |  |  |  |  |
Jack Welch Management Institute |  |  |  |  |  |
Schedule of Other Assets [Line Items] |  |  |  |  |  |
Commitment for future services under the perpetual license agreement |  |  |  |  |  | $ 25,300
Prepaid expenses, net of current portion |  | $ 19,500 |  | $ 19,500 |  |
Prepaid expense, amortization period |  |  |  | 15 years |  |

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