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License, Acquisitions and Other Agreements - Taldefgrobep Alfa License Agreement (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
License and other agreements
Milestone payment to be paid upon regulatory achievement	$ 641,975,000		$ 641,975,000
Research and development	157,607,000	$ 95,517,000	628,398,000	$ 238,468,000
BMS
License and other agreements
Research and development	0	$ 0	0	$ 0
BMS | Taldefgrobep Alfa License Agreement
License and other agreements
Milestone payment to be paid upon regulatory achievement	$ 200,000,000		$ 200,000,000

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