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Financial Royalty Assets, net (formerly known as Commercial License Rights) - Narrative (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | --- | ---
May 31, 2017 | Nov. 30, 2023 | Mar. 31, 2024 | Dec. 31, 2023 | Oct. 31, 2023
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Impairment of commercial license rights |  |  | $ 0 |  |
Gross carrying value(2) |  |  | 73,363,000 | $ 70,364,000 |
Tolerance Therapeutics (TZIELD) |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Product royalty (as a percent) |  | 1.00% |  |  |
Cash payments for acquisition |  | $ 20,000,000 |  |  |
Elutia (CorMatrix) |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Proceeds from royalties received | $ 10,000,000 |  |  |  |
Product royalty (as a percent) | 5.00% |  |  |  |
Credit loss adjustment |  |  | 3,000,000 |  |
Gross carrying value(2) |  |  | 12,680,000 | 13,304,000 |
Elutia (CorMatrix) | Maximum |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Additional royalties receivable under sales-based milestones | $ 10,000,000 |  |  |  |
Ovid (Soticlestat) |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross carrying value(2) |  |  | 30,310,000 | 30,310,000 |
Ovid (Soticlestat) | Soticlestat |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Consideration paid for an interest in potential development milestone |  |  |  |  | $ 30,000,000
Interest in sales revenue (as a percent) |  |  |  |  | 13.00%
Ensifentrine inventors |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross carrying value(2) |  |  | $ 3,827,000 | $ 0 |

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