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Liability Related to Sale of Future Royalties (Details) - Royalty Purchase Agreement [Member] - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 | Sep. 30, 2025 | Sep. 30, 2024
Royalty Revenue Monetization [Abstract] |  |  |
Upfront payment received | $ 500.0 |  |
Maximum amount of payments receivable for additional milestones |  | $ 625.0 |
Transaction costs | $ 10.4 |  |
Effective interest rate |  | 12.40% | 13.50%
SPINRAZA [Member] |  |  |
Royalty Revenue Monetization [Abstract] |  |  |
Maximum amount of annual sales on which royalty payments are paid |  | $ 1,500.0 |
SPINRAZA [Member] | Minimum [Member] |  |  |
Royalty Revenue Monetization [Abstract] |  |  |
Percentage of royalty payments paid on annual sales of medicine |  | 25.00% |
Maximum royalty payments made before royalty interest reverts back |  | $ 475.0 |
SPINRAZA [Member] | Maximum [Member] |  |  |
Royalty Revenue Monetization [Abstract] |  |  |
Percentage of royalty payments paid on annual sales of medicine |  | 45.00% |
Maximum royalty payments made before royalty interest reverts back |  | $ 550.0 |
Pelacarsen [Member] |  |  |
Royalty Revenue Monetization [Abstract] |  |  |
Percentage of royalty payments paid on annual sales of medicine |  | 25.00% |

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