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Research & Development ("R&D") Funding Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Research and Development Arrangement, Contract to Perform for Others [Line Items]      
Research and development funding expense $ 177,106 $ 200,084 $ 26,289
Upfront payment and premium paid   193,200  
Merck to Fund      
Research and Development Arrangement, Contract to Perform for Others [Line Items]      
Research and development funding expense 50,000    
Cytokinetics      
Research and Development Arrangement, Contract to Perform for Others [Line Items]      
Research and development funding expense 100,000    
Theravance Biopharma      
Research and Development Arrangement, Contract to Perform for Others [Line Items]      
Research and development funding expense $ 25,000    
Funding Agreements With Sanofi      
Research and Development Arrangement, Contract to Perform for Others [Line Items]      
Research and development funding expense   6,900 20,500
MorphoSys      
Research and Development Arrangement, Contract to Perform for Others [Line Items]      
Research and development funding expense   90,000  
MorphoSys | BioCryst Pharmaceuticals, Inc.      
Research and Development Arrangement, Contract to Perform for Others [Line Items]      
Research and development funding expense   $ 103,200  
Funding Agreement With BioCryst      
Research and Development Arrangement, Contract to Perform for Others [Line Items]      
Research and development funding expense     $ 5,800