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Other Assets - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2027 | Dec. 31, 2019
Schedule of Other Assets [Line Items] |  |  |
Prepaid expenses, net of current portion | $ 22,418 |  | $ 191
Funds received from investor | $ 2,800 |  |
Minimum | Certain Limited Partnerships |  |  |
Schedule of Other Assets [Line Items] |  |  |
Partnership interest (as a percentage) | 3.00% |  |
Maximum | Certain Limited Partnerships |  |  |
Schedule of Other Assets [Line Items] |  |  |
Partnership interest (as a percentage) | 5.00% |  |
Forecast |  |  |
Schedule of Other Assets [Line Items] |  |  |
Additional investment |  | $ 1,800 |
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 | $ 20,700 |  |
Prepaid expense, amortization period | 15 years |  |
Funds received from investor | $ 2,800 |  |

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