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Reverse capitalization - Retroactive Application of Reverse Capitalization to Consolidated Balance Sheets (Details) - shares
1 Months Ended 12 Months Ended
Jan. 07, 2021
Jan. 31, 2021
Dec. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Schedule Of Reverse Capitalization [Line Items]                
Convertible Preferred shares authorized (in shares)     155,387,025 0        
Convertible preferred shares issued (in shares)     139,444,346 0        
Convertible preferred shares outstanding (in shares)     139,444,346 0        
Common shares authorized (in shares)     351,572,668       351,572,668  
Common shares issued (in shares)     89,972,184       88,674,206  
Common shares outstanding (in shares)     89,206,266       88,279,119 87,362,592
1/7/21 conversion ratio 206.81% 206.81% 206.81%          
Convertible Preferred stock                
Schedule Of Reverse Capitalization [Line Items]                
Convertible Preferred shares authorized (in shares)     155,387,025       155,387,025  
Convertible preferred shares issued (in shares)     139,444,346       139,444,346  
Convertible preferred shares outstanding (in shares)     139,444,346 0 139,444,346 139,444,346 139,444,346 139,444,346
Previously Reported                
Schedule Of Reverse Capitalization [Line Items]                
Common shares authorized (in shares)     170,000,000       170,000,000  
Common shares issued (in shares)     43,505,291       42,877,665  
Common shares outstanding (in shares)     43,134,938       42,686,624 42,243,445
Previously Reported | Convertible Preferred stock                
Schedule Of Reverse Capitalization [Line Items]                
Convertible Preferred shares authorized (in shares)     75,136,086       75,136,086  
Convertible preferred shares issued (in shares)     67,427,138       67,427,138  
Convertible preferred shares outstanding (in shares)     67,427,138       67,427,138 67,427,138