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Revenue - Disaggregation of Revenue (Details) - 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]
Net revenue	$ 131,512	$ 84,306	$ 361,761	$ 202,096
Platform services revenue, net
Disaggregation of Revenue [Line Items]
Net revenue	126,388	81,620	350,884	195,260
Other services revenue
Disaggregation of Revenue [Line Items]
Net revenue	$ 5,124	$ 2,686	$ 10,877	$ 6,836

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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