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Summary of Significant Accounting Policies - Summary of Revenue Recognition (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Revenue	$ 150,432	$ 111,007	$ 285,064	$ 216,802
Transaction [Member]
Disaggregation of Revenue [Line Items]
Revenue	73,360	50,429	134,748	96,015
Subscription [Member]
Disaggregation of Revenue [Line Items]
Revenue	69,384	53,832	134,877	108,067
Partner [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 7,688	$ 6,746	$ 15,439	$ 12,720

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