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Financial Royalty Assets, net - Narrative (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 31, 2017 | Nov. 30, 2023 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | May 31, 2025 | Jan. 31, 2025 | Dec. 31, 2024 | Aug. 31, 2024 | Jul. 15, 2024 | Mar. 31, 2024 | Sep. 18, 2023
Finite-Lived Intangible Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment loss of financial royalty assets |  |  | $ 0 |  | $ 0 | $ 26,491,000 |  |  |  |  |  |  |
Gross carrying value |  |  | 221,704,000 |  | 221,704,000 |  |  |  | $ 198,587,000 |  |  |  |
Ohtuvayre inventors |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Gross carrying value |  |  |  |  |  |  |  | $ 1,800,000 |  | $ 13,600,000 |  | $ 3,800,000 |
APEIRON |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Contract assets (financial royalty assets) |  |  |  | $ 106,156,000 |  | 106,156,000 |  |  |  |  | $ 106,156,000 |  |
Deferred tax liability |  |  |  |  |  |  |  |  |  |  | 18,109,000 |  |
Tolerance Therapeutics (Tzield®) |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Cash payments for acquisition |  | $ 20,000,000 |  |  |  |  |  |  |  |  |  |  |
Product royalty (as a percent) |  | 1.00% |  |  |  |  |  |  |  |  |  |  |
Deferred tax liability |  |  |  |  |  |  |  |  | 5,500,000 |  |  |  |
Ovid Therapeutics |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment loss of financial royalty assets |  |  |  |  |  | 26,200,000 |  |  |  |  |  |  |
Selexis |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment loss of financial royalty assets |  |  |  |  |  | 300,000 |  |  |  |  |  |  |
Elutia (CorMatrix) |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Product royalty (as a percent) | 5.00% |  |  |  |  |  |  |  |  |  |  |  |
Gross carrying value |  |  | 8,466,000 |  | 8,466,000 |  |  |  | 9,418,000 |  |  |  |
Proceeds from royalties received | $ 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from common stock in lieu of cash payment |  |  |  |  |  |  | $ 2,300,000 |  |  |  |  |  |
Credit loss adjustment |  |  | 200,000 | $ 300,000 | 1,000,000 | $ 4,900,000 |  |  |  |  |  |  |
Elutia (CorMatrix) | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Additional royalties receivable under sales-based milestones | $ 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Qarziba |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Gross carrying value |  |  | $ 112,052,000 |  | $ 112,052,000 |  |  |  | $ 105,329,000 |  |  |  |
Qarziba | APEIRON |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Contract assets (financial royalty assets) |  |  |  |  |  |  |  |  |  |  | 104,900,000 |  |
Primrose mRNA |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration paid |  |  |  |  |  |  |  |  |  |  |  |  | $ 15,000,000
Percentage of milestones (as a percent) |  |  | 50.00% |  | 50.00% |  |  |  |  |  |  |  |
Others | APEIRON |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Contract assets (financial royalty assets) |  |  |  |  |  |  |  |  |  |  | $ 1,300,000 |  |

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