Stock-based Compensation (Tables)

6 Months Ended

Jun. 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 three and six months ended June 30, 2017 were calculated using the Black-Scholes-Merton option-pricing model with the following assumptions:    

	Three Months Ended June 30,	Six Months Ended June 30,
	2017
Expected life	7 years	7 years
Volatility	40.97%	37.88%-40.97%
Risk-free interest rate	1.96%	1.96%-2.26%
Dividend yield	—%	—%
Weighted-average grant date fair value	4.89	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:

	Three and Six Months Ended June 30, 2018
Expected life	0.5 years
Volatility	37.01%
Risk-free interest rate	1.61%
Dividend yield	—%
Weighted-average grant date fair value	$7.82

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	(2,108,485)	5.10			0
Options forfeited	(289,712)	9.18
Options forfeited or canceled	(6,941)	8.44
Outstanding at June 30, 2018	10,775,812	6.46		6.57	179,242
Options exercisable at June 30, 2018	7,833,599	$	5.49	6.02	$	137,856

Schedule of Nonvested Restricted Stock Units Activity

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

	Restricted Stock Units		Weighted Average Grant-Date Fair Value
Unvested outstanding at December 31, 2017	981,276		$	22.78
Granted	1,134,858		21.49
Vested	(31,022	)	22.67
Forfeited or canceled	(74,926	)	22.22
Unvested outstanding at June 30, 2018	2,010,186		$	22.07

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 June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Cost of revenue	$	1,392	$	699	$	2,691	$	1,414
Technology and development	1,726		751		3,200		1,482
Marketing	157		123		276		242
General and administrative	1,503		1,065		2,808		2,182
Total stock-based compensation	$	4,778	$	2,638	$	8,975	$	5,320