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Significant Accounting Policies (Policies) | 9 Months Ended
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Sep. 30, 2023
Significant Accounting Policies [Abstract] |
Liability Related to Sale of Future Royalties | Liability Related to Sale of Future Royalties In January 2023, we entered into a royalty purchase agreement with Royalty Pharma Investments, or Royalty Pharma, to monetize a portion of our future SPINRAZA and pelacarsen royalties we are entitled to under our arrangements with Biogen and Novartis, respectively. Refer to Note 11, Liability Related to Sale of Future Royalties, for further details on the agreement. Under our agreement with Royalty Pharma, we record upfront payments and milestone payments we receive from the sale of future royalties as a liability, net of transaction costs. We record royalty payments made to Royalty Pharma as a reduction of the liability and amortize the transaction costs over the estimated life of the royalty stream. We account for the associated interest expense under the effective interest rate method, while continuing to recognize the full amount of royalty revenue in the period in which the counterparty sells the related product and recognizes the related revenue. We calculate the liability related to the sale of future royalties, effective interest rate and the related interest expense using our current estimate of anticipated future royalty payments under the arrangement, which we periodically reassess based on internal projections and information from our partners who are responsible for commercializing the medicines. If there is a material change in our estimate, we will prospectively adjust the liability related to the sale of future royalties, effective interest rate and the related interest expense.
Recently Adopted Accounting Standards | Recently Adopted Accounting Standards We do not expect any recently issued accounting standards to have a material impact to our financial results.

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- Definition Disclosure of inventory accounting policy for liability related to sale of future royalties. + References No definition available. + Details
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- Definition Disclosure of accounting policy pertaining to new accounting pronouncements that may impact the entity's financial reporting. Includes, but is not limited to, quantification of the expected or actual impact. + References No definition available. + Details
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