Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Value Assumptions

The range of assumptions for the years ended December 31, 2015, 2016, and 2017, are provided in the following table.

	Year End December 31,
	2015	2016	2017
Expected life	7 years	7 years	7 years
Volatility	42.51%-49.62%	38.15%-41.36%	37.88%-40.97%
Risk-free interest rate	1.71%-2.01%	1.39%-2.32%	1.96%-2.26%
Dividend yield	—%	—%	—%
Weighted-average grant date fair value	$3.99	$4.11	$4.86

Schedule of Stock Option Activity

The following table presents information regarding options granted, exercised, forfeited, or cancelled for the periods presented:

	Number Of Options		Weighted- Average Exercise Price		Weighted Average Remaining Contractual Life (years)	Aggregate Intrinsic Value
Outstanding at January 1, 2017	13,291,684		$	5.85	7.74	$	61,774
Options granted	1,137,046		10.78
Options exercised	(744,215	)	4.03			20,308
Options forfeited or canceled	(503,565	)	7.95
Outstanding at December 31, 2017	13,180,950		6.30		7.02	329,786
Options exercisable at December 31, 2017	8,754,523		4.94		6.25	230,914

Schedule of Share-based Compensation, Restricted Stock Units Award Activity

The following table summarizes activity for restricted stock units for the year ended December 31, 2017:

	Restricted Stock Units		Weighted Average Grant-Date Fair Value
Unvested outstanding at January 1, 2017	—		$	—
Granted	981,929		22.78
Vested	—		—
Forfeited or canceled	(653	)	22.78
Unvested outstanding at December 31, 2017	981,276		$	22.78

Schedule of Allocation of Share-based Compensation Costs

The following table presents the detail of stock-based compensation amounts included in the Company’s consolidated statements of operations for the periods indicated below:

	Year End December 31,
	2015		2016		2017
Cost of revenue	$	1,440	$	2,266	$	2,902
Technology and development	1,375		2,383		3,325
Marketing	298		469		487
General and administrative	2,449		3,295		4,387
Total stock-based compensation	$	5,562	$	8,413	$	11,101