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Convertible Notes Payable - Summary of Convertible Notes Payable (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Short Term Debt [Line Items]    
Convertible notes payable $ 26,600 $ 12,159
Accrued interest 600 114
Unamortized debt discount   (1,000)
March 2020 Notes    
Short Term Debt [Line Items]    
Convertible notes payable 10,000  
December 2019 Notes    
Short Term Debt [Line Items]    
Convertible notes payable 6,000 3,045
August 2019 Notes    
Short Term Debt [Line Items]    
Convertible notes payable $ 10,000 $ 10,000