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Investments - Additional Information (Details) $ in Millions | 1 Months Ended | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2021 EUR (€) | Dec. 31, 2020 USD ($) | Sep. 30, 2019 USD ($) | May 31, 2014 EUR (€)
Synchronicity Pharma Inc | Investee | Other (Expense) Income, Net |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |
Other-than-temporary impairment charge | $ 1.0 | $ 0.9 |  |  |  |
Synchronicity Pharma Inc | Convertible Promissory Notes | Investee |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |
Purchase of convertible promissory notes |  |  |  |  | $ 1.9 |
Fountain Healthcare Partners II |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |
Funding commitment as percentage of partnership's total funding |  | 7.00% | 7.00% |  |  |
Equity method commitment | € |  |  | € 7,200,000 |  |  |
Fountain Healthcare Partners II | Other Assets |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |
Carrying value of equity investment |  | $ 5.9 |  | $ 6.2 |  |
Fountain Healthcare Partners II | Maximum |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |
Commitment on equity method investment | € |  |  |  |  |  | € 7,400,000

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