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Accrued Expenses (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Supplier Finance Program [Line Items]    
External research and development expenses $ 2,870 $ 11,630
Employee related expenses 3,488 11,516
Sublicense and license fees 0 6,609
Intellectual property and patent related fees 685 1,471
Professional service expenses 432 1,593
Other expenses 258 808
Total accrued expenses 48,068 45,859
Employee termination benefits    
Supplier Finance Program [Line Items]    
Restructuring reserve 6,592 10,475
Contract termination costs    
Supplier Finance Program [Line Items]    
Restructuring reserve $ 33,743 $ 1,757