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Debt - Components of Debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Debt Disclosure [Abstract]    
Face value of outstanding convertible debt $ 800,000 $ 450,000
Debt issuance costs, unamortized (12,621) (5,646)
Discount on debt (238,634) (88,036)
Debt, long-term $ 548,745 $ 356,318