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Acquisitions - Exonics Therapeutics (Details) - USD ($)
12 Months Ended
Jul. 16, 2019
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]      
Fair value of contingent development and regulatory payments   $ 172,041,000  
Goodwill   1,002,158,000 $ 50,384,000
Intangible asset   $ 400,000,000.0 $ 0
Exonics Therapeutics      
Business Acquisition [Line Items]      
Upfront payment (adjusted for customary working capital adjustments) $ 266,315,000    
Fair value of contingent development and regulatory payments 172,041,000    
Total purchase price 438,356,000    
Cash and cash equivalents 19,535,000    
Goodwill 397,141,000    
Intangible asset 13,000,000    
Net other assets $ 8,680,000