Liability Related to Sale of Future Royalties -Schedule of Activity Within Liability Related to Sale of Future Royalties (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Liability Related To Sale Of Future Royalties [Line Items]
Current portion of liability related to sale of future royalties	$ (32,100)	$ (50,567)
Liability related to sale of future royalties, non-current	41,079	$ 43,485
Royalty Agreements
Liability Related To Sale Of Future Royalties [Line Items]
Beginning balance	94,052
Zolgensma royalties paid to HCR	(22,959)
Interest expense recognized	2,086
Ending balance	73,179
Current portion of liability related to sale of future royalties	(32,100)
Liability related to sale of future royalties, non-current	$ 41,079