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Collaborative Arrangements - Bristol Meyers Squibb Company - Narrative (Details) - Bristol Myers Squibb Company - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Licensing Agreements        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]        
Royalty rate, deduction     0.50  
Licensing Agreements | Alliance Revenue - Reblozyl        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]        
Eligible future contingent sales-based milestone payments (up to) $ 80   $ 80  
Collaborative Arrangement, Transaction with Party to Collaborative Arrangement        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]        
Revenue from collaborative arrangement $ 90 $ 47 $ 161 $ 90
Minimum | Licensing Agreements        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]        
Royalty rate     20.00%  
Maximum | Licensing Agreements        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]        
Royalty rate     24.00%