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Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2017

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Schedule of stock-based compensation expense by operating expense category

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

		Three Months Ended								Nine Months Ended
		September 30,								September 30,
		2017				2016				2017				2016
Platform operations		$	818			$	75			$	1,543			$	114
Sales and marketing			1,500				200				3,277				318
Technology and development			1,990				216				3,981				330
General and administrative			1,585				165				3,605				286
Total		$	5,893			$	656			$	12,406			$	1,048

Summary of stock option activity

Stock option activity for the nine months ended September 30, 2017 was as follows:

		Shares Under Option (in thousands)				Weighted- Average Exercise Price
Outstanding as of December 31, 2016 (1)			5,429			$	4.94
Granted			966				40.55
Exercised			(1,758	)			1.01
Cancelled			(192	)			17.17
Outstanding as of September 30, 2017 (2)			4,445			$	13.71
Exercisable as of September 30, 2017			2,163			$	3.63

(1) Includes options to purchase 389 and 5,040 shares of Class A and Class B common stock, respectively.

(2) Includes options to purchase 1,296 and 3,149 shares of Class A and Class B common stock, respectively.

Schedule of Nonvested Restricted Stock Activity

Restricted Stock activity for the nine months ended September 30, 2017 was as follows:

		Shares (in thousands)				Weighted- Average Grant Date Fair Value
Unvested as of December 31, 2016			193			$	29.65
Granted			123				35.25
Vested			(1	)			22.90
Forfeited			(28	)			29.92
Unvested as of September 30, 2017			287			$	32.07

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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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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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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