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Convertible Senior Notes - Convertible Debt Balances (Details) - Convertible Debt - Convertible Senior Notes - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Sep. 25, 2020
Liability:      
Principal amount $ 575,000 $ 575,000  
Unamortized discount (81,870) (95,744)  
Unamortized debt issuance costs (10,308) (12,055)  
Convertible senior notes, liability component 482,822 467,201 $ 461,800
Convertible senior notes, equity component $ 72,732 $ 72,732 $ 72,700