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Stock-Based Compensation - Schedule of Stock-Based Compensation Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Stock-based compensation expense, by operating expense category
Stock-based compensation expense	$ 34,459	$ 26,852	$ 132,010	$ 73,751
Platform operations
Stock-based compensation expense, by operating expense category
Stock-based compensation expense	2,518	1,639	11,624	5,459
Sales and marketing
Stock-based compensation expense, by operating expense category
Stock-based compensation expense	9,099	6,916	37,362	18,549
Technology and development
Stock-based compensation expense, by operating expense category
Stock-based compensation expense	11,269	7,911	41,337	24,345
General and administrative
Stock-based compensation expense, by operating expense category
Stock-based compensation expense	$ 11,573	$ 10,386	$ 41,687	$ 25,398

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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