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Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2018

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Schedule of Stock-Based Compensation Expense by Operating Expense Category

Stock-based compensation expense recorded in the condensed consolidated statements of operations was as follows (in thousands):

		Three Months Ended								Nine Months Ended
		September 30,								September 30,
		2018				2017				2018				2017
Platform operations		$	1,234			$	818			$	3,137			$	1,543
Sales and marketing			3,033				1,500				7,757				3,277
Technology and development			4,013				1,990				8,905				3,981
General and administrative			3,137				1,585				8,159				3,605
Total		$	11,417			$	5,893			$	27,958			$	12,406

Summary of Stock Option Activity

The following summarizes stock option activity:

		Shares Under Option (in thousands)				Weighted- Average Exercise Price
Outstanding as of December 31, 2017			4,745			$	17.96
Granted			1,253				59.61
Exercised			(1,110	)			6.46
Cancelled			(59	)			44.31
Outstanding as of September 30, 2018			4,829			$	31.09
Exercisable as of September 30, 2018			2,016			$	12.36

Summary of Nonvested Restricted Stock Activity

The following summarizes Restricted Stock activity:

		Shares (in thousands)				Weighted- Average Grant Date Fair Value
Unvested as of December 31, 2017			418			$	39.95
Granted			126				57.04
Vested			(43	)			40.92
Forfeited			—				—
Unvested as of September 30, 2018			501			$	44.17

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Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed.

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Tabular disclosure of the changes in outstanding nonvested performance-based units.

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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