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Convertible Notes - Carrying and fair value (Details) - Convertible Notes
$ in Thousands
Sep. 30, 2020
USD ($)
Convertible Notes  
Par value of the Convertible Notes $ 201,250
Unamortized debt discounts (30,226)
Unamortized debt issuance costs (3,002)
Net carrying value of Convertible Notes 168,022
Fair value of Convertible Notes $ 181,850