Related Party Transactions - Schedule of Expenses Related to Related Party Which are Settled in Cash (Details) - USD ($)		3 Months Ended		9 Months Ended
		Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Related Party Transaction [Line Items]
Total related party expense	[1]	$ 89,169,000	$ 45,247,000	$ 215,083,000	$ 127,015,000
Related Party
Related Party Transaction [Line Items]
Total related party expense		100,000	7,000,000.0	3,200,000	9,600,000
Paragon and License Agreement | Related Party
Related Party Transaction [Line Items]
Total related party expense		100,000	7,000,000.0	3,200,000	9,600,000
License Agreements milestone and sublicensing fees | Related Party
Related Party Transaction [Line Items]
Total related party expense		100,000	7,000,000.0	3,100,000	9,500,000
Other Paragon Reimbursable Expenses | Related Party
Related Party Transaction [Line Items]
Total related party expense		$ 0	$ 0	$ 100,000	$ 100,000

[1] Includes related party expenses of $0.1 million and $7.0 million for the three months ended September 30, 2026 and 2025, respectively. Includes related party expenses of $3.2 million and $9.6 million for the nine months ended September 30, 2026 and 2025, respectively.