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Convertible Note - Liability and Equity Components of the Convertible Notes (Details) - Convertible Debt - the “Notes” - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Principal amount $ 575,000 $ 575,000
Unamortized discount 0 (132,797)
Unamortized issuance costs (14,438) (12,298)
Net carrying amount of liability component 560,562 429,905
Conversion feature 0 136,402
Issuance costs 0 (3,928)
Net carrying amount of equity component 0 132,474
Estimated fair value $ 495,271 $ 450,437