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Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2019

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Stock Option Activity

The following is a summary of the stock option activity for all stock‑based compensation plans during the year ended December 31, 2019:

		Common Stock				Weighted- Average Exercise Price for Equity				Weighted- Average Remaining Contractual Life (In Years)				Aggregate Intrinsic Value(1)
Outstanding, December 31, 2018			1,807,515			$	2.35			5.9				$	56,716
Granted			—				—
Exercised			(838,928	)		2.16									28,902
Forfeited and cancelled			(25,702	)		5.09
Outstanding, December 31, 2019			942,885			$	2.45				5.0			$	30,859
Options exercisable at December 31, 2019			913,197			$	2.31				5.0			$	30,016

⁽¹⁾ The aggregate intrinsic value as of December 31, 2019 and 2018 was calculated based on the positive difference, if any, between the estimated fair value of our common stock on December 31, 2019 and 2018, respectively, or the date of exercise, as appropriate, and the exercise price of the underlying options.

Summary of Restricted Stock Unit Activity

The following is a summary of the RSU activity during the year ended December 31, 2019:

		Number of Shares				Weighted- Average Grant Date Fair Value				Aggregate Intrinsic Value
Unvested outstanding, December 31, 2018			2,973,002			$	26.06			$	100,279
Granted			1,811,208				39.07
Vested			(1,317,736	)			23.93
Forfeited			(383,173	)			31.70
Unvested outstanding, December 31, 2019			3,083,301			$	33.89			$	108,471

Summary of Stock-based Compensation Expense by Award Type

		Year Ended December 31,
		2019				2018				2017
Options		$	155			$	247			$	281
RSUs			34,146				20,547				4,747
Total stock-based compensation expense		$	34,301			$	20,794			$	5,028

Summary of Allocation of Stock-based Compensation Expense

		Year Ended December 31,
		2019				2018				2017
Cost of revenue		$	354			$	354			$	151
Sales and marketing expense			9,989				5,111				1,911
Product, technology, and development expense			15,159				9,865				1,637
General and administrative expense			8,799				5,464				1,329
Total stock-based compensation expense		$	34,301			$	20,794			$	5,028

Summary of Shares of Common Stock Reserved for Future Issuance

At December 31, 2019, the Company had reserved the following shares of voting common stock for future issuance:

Common stock options outstanding			942,885
Restricted stock units outstanding			3,083,301
Shares available for issuance under the 2017 Plan			5,889,929
Total shares of authorized common stock reserved for    future issuance			9,916,115

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