Collaboration and License Agreements - License Agreement with Sanofi (Details) $ in Thousands		12 Months Ended
	Sep. 09, 2024 USD ($) engager	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Sep. 30, 2025 USD ($)
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Research and development		$ 455,966	$ 506,499	$ 579,720
Sanofi Agreement
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Number of oncology TCEs | engager	3
Upfront	$ 100,000
Milestone payment in escrow	75,000
Payment made from escrow account					$ 75,000
Maximum future development and regulatory milestone payments	323,000
Maximum commercial net sales-based milestone payments	$ 1,490,000
Asset acquisition, period for execution of transaction (in years)	2 years
Payments for asset acquisitions	$ 3,700
Transaction costs	$ 4,612
Sanofi Agreement | Assembled Workforce
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Finite-lived intangible asset, estimated useful life (in years)	5 years