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Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2021

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Schedule of Stock-Based Compensation Expense

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

		Three Months Ended								Nine Months Ended
		September 30,								September 30,
		2021				2020				2021				2020
Platform operations		$	2,518			$	1,639			$	11,624			$	5,459
Sales and marketing			9,099				6,916				37,362				18,549
Technology and development			11,269				7,911				41,337				24,345
General and administrative			11,573				10,386				41,687				25,398
Total		$	34,459			$	26,852			$	132,010			$	73,751

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, 2020			26,481			$	10.73
Granted			1,171				74.52
Exercised			(5,004	)			7.91
Cancelled			(1,186	)			18.20
Outstanding as of September 30, 2021			21,462			$	14.45
Exercisable as of September 30, 2021			13,962			$	7.97

Summary of Restricted Stock Activity

The following summarizes restricted stock activity:

		RSU (in thousands)				Weighted- Average Grant Date Fair Value
Unvested as of December 31, 2020			5,698			$	26.10
Granted			2,166				73.70
Vested			(1,494	)			22.41
Forfeited			(575	)			28.72
Unvested as of September 30, 2021			5,795			$	44.58

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Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-Section 50
-Paragraph 2
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Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

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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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