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Collaboration Agreements (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Feb. 13, 2024
Related Party Transaction [Line Items]      
Collaboration revenue $ 1,657 $ 652  
Research and development 74,310 82,899  
Collaborative Arrangement | ImmunoGen      
Related Party Transaction [Line Items]      
Revenue, remaining performance obligation, amount 2,000    
Collaboration revenue $ 1,700 $ 700  
Collaborative Arrangement | The Ono Agreement | Subsequent Event      
Related Party Transaction [Line Items]      
Revenue, remaining performance obligation, amount     $ 5,400
Revenue, remaining performance obligation, variable consideration amount     $ 224,500
Revenue, remaining performance obligation, timing of termination     90 days