Revenue - Schedule of Net Revenue (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Disaggregation of Revenue [Line Items]
Total revenue	$ 121,469	$ 67,455	$ 292,212	$ 176,731
Revenue from Contract with Customer, Product and Service [Extensible Enumeration]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Amtagvi
Disaggregation of Revenue [Line Items]
Total revenue	$ 101,602	$ 57,482	$ 252,545	$ 155,127
Proleukin
Disaggregation of Revenue [Line Items]
Total revenue	$ 19,867	$ 9,973	$ 39,667	$ 21,604

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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