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Prepaid Expenses and Other Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Dec. 31, 2023
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]      
Research and development $ 0 $ 1,715 $ 278
Collaboration receivable 0 2,864  
Insurance 1,628 340 402
Deposits 0 925 891
Other 78 72 1,295
Prepaid expenses and other assets $ 2,285 $ 5,916 $ 2,866