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Summary of Significant Accounting Policies - Schedule of Significant Expense Categories by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Segment Reporting Information [Line Items]        
Collaboration revenues $ 3,729 $ 3,397 $ 19,632 $ 14,919
Less:        
Net loss (9,266) (18,978) (60,477) (86,879)
Reporting Segment        
Segment Reporting Information [Line Items]        
Collaboration revenues 3,729 3,397 19,632 14,919
Less:        
Research and development, excluding facilities, personnel, depreciation and amortization expenses 1,528 10,191 33,147 45,905
General and administrative, excluding facilities and personnel expenses, depreciation and amortization expenses 2,421 3,656 14,829 19,118
Facilities expense 1,099 1,632 5,917 7,671
Personnel expense 7,354 6,529 24,564 27,324
Depreciation, amortization and interest on finance and sale-leaseback lease liabilities 712 1,185 3,894 3,984
Other segment items(a) (119) (818) (2,242) (2,204)
Net loss $ (9,266) $ (18,978) $ (60,477) $ (86,879)