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Debt, Commitments and Contingencies - Carrying Amount of Liability Component (Details) - Convertible Senior Notes due 2026 - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Principal $ 500,000 $ 0
Unamortized debt discount (67,172) 0
Unamortized debt issuance costs (11,716) 0
Net carrying amount $ 421,112 $ 0