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Summary of Significant Accounting Policies - Schedule of Significant Expense Categories by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Segment Reporting Information [Line Items]                
Collaboration revenues $ 0   $ 9,197   $ 3,729 $ 12,594 $ 19,632 $ 14,919
Less:                
Net loss (9,774) $ (9,266) (11,162) $ (18,978) (19,040) (30,140) (60,477) (86,879)
Reporting Segment                
Segment Reporting Information [Line Items]                
Collaboration revenues 0   9,197   3,729 12,594 19,632 14,919
Less:                
Research and development, excluding facilities, personnel, depreciation and amortization expenses 1,499   7,643   3,027 17,834 33,147 45,905
General and administrative, excluding facilities and personnel expenses, depreciation and amortization expenses 2,836   4,070   5,257 7,726 14,829 19,118
Facilities expense 656   1,794   1,755 3,426 5,917 7,671
Personnel expense 787   6,311   8,141 12,840 24,564 27,324
Depreciation, amortization and interest on finance and sale-leaseback lease liabilities 38   1,153   750 2,338 3,894 3,984
Other segment items 3,958   (612)   3,839 (1,430) (2,242) (2,204)
Net loss $ (9,774)   $ (11,162)   $ (19,040) $ (30,140) $ (60,477) $ (86,879)