Revenue from Contracts with Customers - Additional Information (Details) - USD ($) $ in Thousands	1 Months Ended				3 Months Ended		12 Months Ended
	Jan. 31, 2023	Dec. 31, 2022	Nov. 30, 2022	Oct. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disaggregation Of Revenue [Line Items]
Royalty revenue							$ 1,111,795	$ 1,173,751	$ 1,038,756
Royalty
Disaggregation Of Revenue [Line Items]
Royalty revenue							$ 219,609	$ 436,179	$ 364,966
Royalty | AMPYRA
Disaggregation Of Revenue [Line Items]
Royalty revenue				$ 16,500	$ (3,200)	$ 3,200
Potential additional award to be paid			$ 1,800
Additional award paid		$ 1,800
Arbitration award amount paid				$ 16,500
Repayment of royalty revenue					$ 18,300
Royalty | AMPYRA | Subsequent Event
Disaggregation Of Revenue [Line Items]
Additional sought value for damages	$ 66,000