Stock-based Compensation (Tables)

9 Months Ended

Sep. 30, 2018

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

Schedule of Value Assumptions

The fair value of the options issued under the Amended and Restated 2004 Equity Incentive Plan for the nine months ended September 30, 2017 were calculated using the Black-Scholes-Merton option-pricing model with the following assumptions:    

	Nine Months Ended September 30, 2017
Expected life	7 years
Volatility	37.88%-40.97%
Risk-free interest rate	1.96%-2.26%
Dividend yield	—%
Weighted-average grant date fair value	4.86

The fair value of common shares to be issued under the 2017 ESPP were calculated using the Black-Scholes-Merton option-pricing model with the following assumptions:

	For the Offering Period beginning July 1, 2018
Expected life	0.5 years
Volatility	39.25%
Risk-free interest rate	2.14%
Dividend yield	—%
Weighted-average grant date fair value	$5.94

Schedule of Stock Option Activity

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

	Number Of Options	Weighted- Average Exercise Price		Weighted-Average Remaining Contractual Life (years)	Aggregate Intrinsic Value
Outstanding at December 31, 2017	13,180,950	$	6.30	7.02	$	329,786
Options granted	—	—
Options exercised	(2,653,008)	5.17
Options forfeited	(367,541)	9.45
Options canceled	(9,879)	8.26
Outstanding at September 30, 2018	10,150,522	6.48		6.27	124,054
Options exercisable at September 30, 2018	7,750,226	$	5.67	5.79	$	100,976

Schedule of Nonvested Restricted Stock Units Activity

The following table summarizes activity for restricted stock units for the nine months ended September 30, 2018:

	Restricted Stock Units		Weighted Average Grant-Date Fair Value
Unvested outstanding at December 31, 2017	981,276		$	22.78
Granted	1,400,212		21.17
Vested	(127,746	)	22.57
Forfeited or canceled	(172,569	)	21.86
Unvested outstanding at September 30, 2018	2,081,173		$	21.79

Schedule of Allocation of Share-based Compensation Costs

The following table presents detail of stock-based compensation, net of the amount capitalized in internally developed software, included in the Company’s condensed consolidated statements of operations for the periods indicated below

	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Cost of revenue	$	1,370	$	715	$	4,061	$	2,129
Technology and development	2,135		819		5,334		2,301
Marketing	155		121		431		362
General and administrative	1,838		1,054		4,646		3,236
Total stock-based compensation	$	5,498	$	2,709	$	14,472	$	8,028