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Stock-based Compensation - Summary of stock options (Details) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2020
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]        
Outstanding as of December 31, 2019 365,938      
Granted 921,721 366,988    
Forfeited (87,685) (1,050)    
Outstanding as of September 30, 2020 1,199,974 365,938    
Vested and exercisable as of September 30, 2020     59,538 26,035
Vested and expected to vest as of September 30, 2020     1,199,974 365,938
Outstanding as of December 31, 2019 $ 22.73      
Granted 22.73 $ 22.73    
Forfeited 22.73 22.73    
Outstanding as of September 30, 2020 22.73 22.73    
Vested and exercisable as of September 30, 2020 $ 22.73 $ 22.73 $ 22.73 $ 22.73
Vested and expected to vest as of September 30, 2020     $ 22.73 $ 22.73
Outstanding as of December 31, 2019 9 years 3 months 25 days 9 years 9 months 3 days    
Granted   9 years 9 months 3 days    
Forfeited   9 years 7 months 9 days    
Outstanding as of September 30, 2020 9 years 3 months 25 days 9 years 9 months 3 days    
Vested and exercisable as of September 30, 2020 9 years 21 days 9 years 9 months    
Vested and expected to vest as of September 30, 2020 9 years 3 months 25 days 9 years 9 months 3 days    
Outstanding as of December 31, 2019 $ 22 $ 22    
Outstanding as of September 30, 2020 $ 141,657 $ 22    
Vested and exercisable as of September 30, 2020     $ 7,028 $ 2
Vested and expected to vest as of September 30, 2020     $ 141,657 $ 22