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Revenue Recognition - Additional Information (Details) - USD ($)
$ in Thousands
1 Months Ended 2 Months Ended 3 Months Ended 9 Months Ended
Jun. 30, 2020
May 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Disaggregation Of Revenue [Line Items]            
Performance obligation unsatisfied     $ 12,200   $ 12,200  
Revenue recognized     $ 13,120 $ 8,195 $ 9,137 $ 9,984
All Marketplace Subscriptions            
Disaggregation Of Revenue [Line Items]            
Percentage fee reduction on marketplace subscription services   50.00%        
United States            
Disaggregation Of Revenue [Line Items]            
Percentage fee reduction on marketplace subscription services 20.00%          
Canada            
Disaggregation Of Revenue [Line Items]            
Percentage fee reduction on marketplace subscription services 20.00%          
United Kingdom            
Disaggregation Of Revenue [Line Items]            
Percentage fee reduction on marketplace subscription services 50.00%