Quarterly report pursuant to Section 13 or 15(d)

Preferred Stock - Additional Information (Details)

v3.20.2
Preferred Stock - Additional Information (Details) - USD ($)
$ in Thousands
 1 Months Ended 9 Months Ended
Oct. 31, 2019
Jan. 31, 2019
Sep. 30, 2019
Sep. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Temporary Equity [Line Items]                
Preferred stock, authorized shares       10,000,000 10,000,000      
Preferred stock, issued shares       0 0      
Preferred stock, outstanding shares       0 0      
Convertible preferred stock, authorized shares   20,762,168            
Gross proceeds from convertible preferred stock     $ 50,000          
Preferred stock exchange including deemed dividend   $ (5,326)            
Convertible preferred stock convert into common stock 12,904,534              
Convertible preferred stock convert into non-voting common stock 6,409,519              
Series B Preferred Stock                
Temporary Equity [Line Items]                
Issuance, shares   6,963,788 6,963,788          
Gross proceeds from convertible preferred stock   $ 50,000            
Number of preferred shares in exchange   1,405,332 1,405,332          
Preferred stock exchange including deemed dividend   $ (10,090) $ (10,090)          
Convertible preferred stock, outstanding shares     8,369,120          
Series A-2 Preferred                
Temporary Equity [Line Items]                
Number of preferred shares in exchange   (1,405,332) (1,405,332)          
Preferred stock exchange including deemed dividend   $ (4,764) $ 4,764          
Convertible preferred stock, outstanding shares     468,445         1,873,777
Convertible Preferred Stock                
Temporary Equity [Line Items]                
Issuance, shares     6,963,788          
Preferred stock exchange including deemed dividend     $ (5,326)          
Convertible preferred stock, outstanding shares     19,356,835 0 0 19,356,835 19,356,835 12,393,047