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Summary of Significant Accounting Policies - Schedule of significant expense categories by segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Summary of Significant Accounting Policies                
Collaboration revenues $ 45,250     $ 3,385     $ 48,979 $ 15,979
Less:                
Net income(loss) 44,717 $ (9,774) $ (9,266) (12,702) $ (11,162) $ (18,978) 25,677 (42,842)
Reporting Segment                
Summary of Significant Accounting Policies                
Collaboration revenues 45,250     3,385     48,979 15,979
Less:                
Research and development, excluding facilities, personnel, depreciation and amortization expenses (383)     4,844     2,644 22,678
General and administrative, excluding facilities and personnel expenses, depreciation and amortization expenses (47)     1,561     5,210 9,287
Facilities expense 81     1,302     1,836 4,728
Personnel expense 1,784     8,085     9,925 20,925
Depreciation, amortization and interest on finance and sale-leaseback lease liabilities 1     613     751 2,951
Other segment items (903)     (318)     2,936 (1,748)
Net income(loss) $ 44,717     $ (12,702)     $ 25,677 $ (42,842)