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Summary of Significant Accounting Policies - Summary of Revenue Recognition (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Disaggregation of Revenue [Line Items]        
Revenue $ 147,879 $ 131,595 $ 432,943 $ 348,397
Transaction        
Disaggregation of Revenue [Line Items]        
Revenue 66,873 63,850 201,621 159,865
Subscription        
Disaggregation of Revenue [Line Items]        
Revenue 73,317 59,348 208,194 167,415
Partner        
Disaggregation of Revenue [Line Items]        
Revenue $ 7,689 $ 8,397 $ 23,128 $ 21,117