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STATEMENTS OF CHANGES IN CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) (PARENTHETICAL) (UNAUDITED) - USD ($)
$ in Thousands
 3 Months Ended
Sep. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Sale of common stock, offering costs $ 2,538    
Series B Convertible Preferred Stock      
Sale of convertible preferred stock, issuance costs   $ 58 $ 152
Series C Convertible Preferred Stock      
Sale of convertible preferred stock, issuance costs $ 174