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Disaggregation of Revenue - Summary of Disaggregation of Revenue by Transaction Model (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 190,205	$ 151,548	$ 123,616	$ 119,445	$ 126,148	$ 110,397	$ 89,111	$ 82,349	$ 584,814	$ 408,005	$ 296,910
Open Platform Transactions
Disaggregation of Revenue [Line Items]
Revenue									573,242	399,945	291,331
Private Platform Transactions
Disaggregation of Revenue [Line Items]
Revenue									$ 11,572	$ 8,060	$ 5,579

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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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.

+ References

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