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Liability Related to Sale of Future Royalties (Details) - USD ($) $ in Thousands | 1 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 31, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Royalty Revenue Monetization [Abstract] |  |  |  |
Proceeds from sale of future royalties in January 2023 |  | $ 0 | $ 500,000 |
Issuance costs related to sale of future royalties |  | 0 | (10,434) |
Royalty payments to Royalty Pharma |  | (16,236) | (12,562) |
Interest expense related to sale of future royalties |  | 35,949 | $ 32,915 |
Net liability related to sale of future royalties |  | 533,754 |  | $ 513,736
Royalty Purchase Agreement [Member] |  |  |  |
Royalty Revenue Monetization [Abstract] |  |  |  |
Upfront payment received | $ 500,000 |  |  |
Maximum amount of payments receivable for additional milestones |  | $ 625,000 |  |
Effective interest rate |  | 13.50% |  |
Proceeds from sale of future royalties in January 2023 | $ 500,000 |  |  |
Issuance costs related to sale of future royalties |  |  |  | (10,434)
Royalty payments to Royalty Pharma |  | $ (16,236) |  | (44,628)
Interest expense related to sale of future royalties |  | 35,949 |  | 68,238
Amortization of issuance costs related to sale of future royalties |  | 305 |  | 560
Net liability related to sale of future royalties |  | 533,754 |  | $ 513,736
Royalty Purchase Agreement [Member] | SPINRAZA [Member] |  |  |  |
Royalty Revenue Monetization [Abstract] |  |  |  |
Maximum amount of annual sales on which royalty payments are paid |  | $ 1,500,000 |  |
Royalty Purchase Agreement [Member] | 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 |  | $ 475,000 |  |
Royalty Purchase Agreement [Member] | 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 |  | $ 550,000 |  |
Royalty Purchase Agreement [Member] | Pelacarsen [Member] |  |  |  |
Royalty Revenue Monetization [Abstract] |  |  |  |
Percentage of royalty payments paid on annual sales of medicine |  | 25.00% |  |

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- Definition Amount, after accumulated amortization, of the unamortized liability related to the sale of future royalties, pursuant to a royalty purchase agreement, that the Company is entitled to receive under collaboration agreements with Biogen and Novartis. The balance will be amortized over the estimated life of the arrangement using the effective interest rate method. + References No definition available. + Details
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