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Investments - Additional Information (Details) $ in Thousands, € in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2022 USD ($) | Mar. 31, 2022 USD ($) Portfolio | Sep. 30, 2022 USD ($) | Dec. 31, 2021 USD ($) | Sep. 30, 2022 EUR (€) | Jan. 31, 2022 USD ($)
Investment Holdings [Line Items] |  |  |  |  |  |
Aggregate estimated fair value of investments in unrealized loss position | $ 477,000 |  | $ 477,000 |  |  |
Return of Fountain Healthcare Partners II, L.P. investment |  |  | $ 485 |  |  |
Synchronicity Pharma Inc | Convertible Promissory Notes | Investee |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |
Purchase of convertible promissory notes |  |  |  |  |  | $ 500
Fountain Healthcare Partners II |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |
Funding commitment as percentage of partnership's total funding | 7.00% |  | 7.00% |  | 7.00% |
Equity method commitment | € |  |  |  |  | € 8.0 |
Number of portfolio sold | Portfolio |  | 1 |  |  |  |
Proceeds from sale of portfolio |  | $ 1,000 |  | $ 1,100 |  |
Escrow deposit |  | 100 |  |  |  |
Gain (loss) on sale of investment | $ 500 |  | $ 1,600 |  |  |
Return of Fountain Healthcare Partners II, L.P. investment |  | 500 |  |  |  |
Fountain Healthcare Partners II | Other Assets |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |
Carrying value of equity investment | 6,700 |  | $ 6,700 | $ 6,100 |  |
Other (Expense) Income, Net |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |
Other-than-temporary impairment charge | $ 500 |  |  |  |  |
Other Expense, Net | Fountain Healthcare Partners II |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |
Gain (loss) on sale of investment |  | $ 600 |  |  |  |

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