License and Other Agreements - Broad License Agreement - Success Payment Liability (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Broad Institute
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Success payment liability	$ 3,000	$ 4,400

Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.