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Stock-Based Compensation - Schedule of Stock-Based Compensation Expense by Operating Expense Category (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Stock-based compensation expense, by operating expense category
Stock-based compensation expense	$ 11,417	$ 5,893	$ 27,958	$ 12,406
Platform operations
Stock-based compensation expense, by operating expense category
Stock-based compensation expense	1,234	818	3,137	1,543
Sales and marketing
Stock-based compensation expense, by operating expense category
Stock-based compensation expense	3,033	1,500	7,757	3,277
Technology and development
Stock-based compensation expense, by operating expense category
Stock-based compensation expense	4,013	1,990	8,905	3,981
General and administrative
Stock-based compensation expense, by operating expense category
Stock-based compensation expense	$ 3,137	$ 1,585	$ 8,159	$ 3,605

X

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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