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Collaborative Arrangements - Bristol Meyers Squibb Company - Narrative (Details) - Bristol Myers Squibb Company - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
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]    
Sales milestone payments $ 80  
Collaborative Arrangement, Transaction with Party to Collaborative Arrangement    
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]    
Revenue from collaborative arrangement $ 148 $ 119
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%