Sale of Future IMDELLTRA® Royalties - Schedule of Royalty Sale Liability Activity (Details) $ in Thousands	9 Months Ended
Sep. 30, 2026 USD ($)
Royalty Financing Obligation [Roll Forward]
Balance at December 31, 2025	$ 3,827,379
Balance at September 30, 2026	4,055,531
Royalty Payments
Royalty Financing Obligation [Roll Forward]
Balance at December 31, 2025	906,956
Debt portion of royalties recognized and settled to Royalty Pharma	(2,556)
Accretion of liability	8,181
Balance at September 30, 2026	$ 912,581

Amount of liability recognized for present obligation requiring transfer or otherwise providing economic benefit to others.

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+ Details