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Fair Value Measurements - Summary of Changes of Liabilities for Sale of Future Royalties (Details) - BVF Partners L.P. - BVF Agreement - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | $ 17 | $ 5
Cash received | 0 | 5
Interest accretion | 2 | 2
Ending balance | $ 19 | $ 12

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- Definition Increase in liability for sale of future royalties cash received. + References No definition available. + Details
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- Definition Increase in liability for sale of future royalties interest accretion. + References No definition available. + Details
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- Definition Liability for sale of future royalties. + References No definition available. + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Details
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- Details
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