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Stock-Based Compensation - Schedule of Stock-Based Compensation Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Stock-based compensation expense, by operating expense category
Stock-based compensation expense	$ 23,934	$ 21,057	$ 46,899	$ 36,926
Platform operations
Stock-based compensation expense, by operating expense category
Stock-based compensation expense	2,358	1,331	3,820	2,387
Sales and marketing
Stock-based compensation expense, by operating expense category
Stock-based compensation expense	6,319	4,831	11,633	8,058
Technology and development
Stock-based compensation expense, by operating expense category
Stock-based compensation expense	7,844	6,497	16,434	11,433
General and administrative
Stock-based compensation expense, by operating expense category
Stock-based compensation expense	$ 7,413	$ 8,398	$ 15,012	$ 15,048

X

- Definition

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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