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Fair Value Measurements - Schedule of Recurring Fair Value Measurements Using Significant Unobservable Inputs (Details) - Fair Value, Recurring - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Derivative Liabilities | 2025 Notes | Embedded Derivatives |  |  |  |
Liabilities Measured on Recurring Basis |  |  |  |
As of beginning balance | $ 1,363 | $ 10,017 | $ 2,915 | $ 45,569
Additions |  |  |  | 0
Cash receipt |  |  |  | 0
Payment |  |  |  | (36,915)
Changes in fair value | 322 | (2,829) | (1,230) | 1,466
As of ending balance | 1,685 | 7,188 | 1,685 | 7,188
Derivative Liabilities | 2029 Notes | Embedded Derivatives |  |  |  |
Liabilities Measured on Recurring Basis |  |  |  |
As of beginning balance | 48,093 | 95,392 | 51,819 | 0
Additions |  |  |  | 87,457
Cash receipt |  |  |  | 0
Payment |  |  |  | 0
Changes in fair value | 16,422 | (18,423) | 12,696 | 10,488
As of ending balance | 64,515 | 76,969 | 64,515 | 76,969
ImThera Contingent Consideration Liability |  |  |  |
Liabilities Measured on Recurring Basis |  |  |  |
As of beginning balance | 87,927 | 81,174 | 84,218 | 94,652
Additions |  |  |  | 0
Cash receipt |  |  |  | 0
Payment |  |  |  | (13,750)
Changes in fair value | 1,755 | 66 | 5,464 | (338)
As of ending balance | 89,682 | 81,240 | 89,682 | 81,240
Derivative Assets | 2025 Notes | Capped Call Derivatives |  |  |  |
Assets Measured on Recurring Basis |  |  |  |
As of beginning period | 1,303 | 7,439 | 2,624 | 38,496
Additions |  |  |  | 0
Cash receipt |  |  |  | (22,524)
Payment |  |  |  | 0
Changes in fair value | 324 | (1,668) | (997) | 10,201
As of ending period | 1,627 | 5,771 | 1,627 | 5,771
Derivative Assets | 2029 Notes | Capped Call Derivatives |  |  |  |
Assets Measured on Recurring Basis |  |  |  |
As of beginning period | 21,658 | 32,114 | 23,735 | 0
Additions |  |  |  | 31,637
Cash receipt |  |  |  | 0
Payment |  |  |  | 0
Changes in fair value | 6,353 | (2,517) | 4,276 | 2,040
As of ending period | $ 28,011 | 29,597 | $ 28,011 | 29,597
Convertible Notes Receivable |  |  |  |
Assets Measured on Recurring Basis |  |  |  |
As of beginning period |  | 275 |  | 275
Additions |  |  |  | 0
Cash receipt |  |  |  | 0
Payment |  |  |  | 0
Changes in fair value |  | (275) |  | 275
As of ending period |  | $ 0 |  | $ 0

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- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 101 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-101 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 102 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-102 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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