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Condensed Consolidated Statements of Convertible Preferred Stock and Stockholders' Equity (Deficit) - Parentheticals - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Series B Convertible Preferred Stock    
Stock issuance costs   $ 256
Series C Convertible Preferred Stock    
Stock issuance costs $ 1,637 $ 1,637