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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
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Segment Reporting Information [Line Items]            
Collaboration revenues $ 0   $ 9,197   $ 3,729 $ 12,594
Less:            
Net loss (9,774) $ (9,266) (11,162) $ (18,978) (19,040) (30,140)
Reporting Segment            
Segment Reporting Information [Line Items]            
Collaboration revenues 0   9,197   3,729 12,594
Less:            
Research and development, excluding facilities, personnel, depreciation and amortization expenses 1,499   7,643   3,027 17,834
General and administrative, excluding facilities and personnel expenses, depreciation and amortization expenses 2,836   4,070   5,257 7,726
Facilities expense 656   1,794   1,755 3,426
Personnel expense 787   6,311   8,141 12,840
Depreciation, amortization and interest on finance and sale-leaseback lease liabilities 38   1,153   750 2,338
Other segment items 3,958   (612)   3,839 (1,430)
Net loss $ (9,774)   $ (11,162)   $ (19,040) $ (30,140)