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Debt and Convertible Preferred Stock Warrants - Schedule of Net Carrying Amount of Equity Component of Notes (Details)
$ in Thousands
Sep. 30, 2020
USD ($)
Debt Disclosure [Line Items]  
Issuance costs $ (6,700)
Notes as Equity Component  
Debt Disclosure [Line Items]  
Proceeds allocated to the conversion options (debt discount) 19,787
Issuance costs (767)
Net carrying amount $ 19,020