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Long-Term Debt - Summary of Convertible Notes (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Apr. 30, 2020
Dec. 31, 2019
Aug. 31, 2019
2025 Notes        
Debt Instrument [Line Items]        
Principal $ 1,000,000 $ 1,000,000    
Unamortized debt discount and issuance costs (263,956)      
Net carrying amount 736,044      
Carrying amount of the equity component 286,589 $ 289,900    
2026 Notes        
Debt Instrument [Line Items]        
Principal 1,265,000   $ 1,265,000 $ 1,265,000
Unamortized debt discount and issuance costs (325,875)   (373,224)  
Net carrying amount 939,125   891,776  
Carrying amount of the equity component $ 377,432   $ 377,432