Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2015

Stockholders' Equity [Abstract]

Stock Based Compensation Expense Included in Condensed Consolidated Statements of Income

Stock‑based compensation expense included in the Company’s consolidated statements of operations during the periods presented is as follows (in thousands):

	Three months ended  June 30,				Six months ended June 30,
	2015		2014		2015		2014
	(unaudited)
Stock-based compensation expense:
Marketing	$	304	$	266	$	655	$	499
Technology and development		1,121		787		2,180		1,406
Customer service and operations		294		209		602		402
General and administrative		1,531		1,071		3,048		1,950
Total stock-based compensation	$	3,250	$	2,333	$	6,485	$	4,257

Weighted Average Assumptions for Options Granted

	Three months ended  June 30,		Six Months Ended June 30,
	2015	2014	2015	2014
	(unaudited)
Expected term (in years)	5.8	5.6	6.0	6.2
Risk-free interest rate	1.67%	1.67%	1.65%	2.03%
Dividend yield	None	None	None	None
Volatility rate	45%	36%	35%	43%

Stock Option Activity and Related Information

The following table presents the stock option activity and related information for the six months ended June 30, 2015:

		Weighted-		Weighted-	Aggregate
		Average		Average	Intrinsic
	Options	Exercise		Contractual Term	Value
	Outstanding	Price		(In Years)	(in Millions)
	(unaudited)
Outstanding as of December 31, 2014	6,132,641	$	11.62	6.17	$	50.4
Granted	685,690		16.27
Exercised (1)	(590,479)		4.24
Forfeited or cancelled	(303,135)		15.98
Outstanding as of June 30, 2015	5,924,717	$	12.67	6.21	$	57.8
Exercisable as of June 30, 2015	3,695,958	$	9.42	4.99	$	46.3
Vested and expected to vest as of June 30, 2015	5,892,328	$	12.63	6.20	$	57.6

(1) Exercised options in the table above included both settled and unsettled exercises during the six months ended June 30, 2015

Schedule Of Share Based Compensation Arrangement By Share Based Payment Award, Options, Grants In Period, Grant Date Intrinsic Value and Weighted Average Grant Date Fair Value [TableTextBlock]

The following table presents the total intrinsic value of stock options exercised and the weighted-average grant date fair value of stock options granted for the periods presented:

		Three months ended  June 30,				Six months ended June 30,
(In millions except per share data)		2015	2014			2015	2014
		(unaudited)				(unaudited)
Total intrinsic value of stock options exercised	$	3.5	$	3.6	$	7.3	$	11.4
Weighted-average per share grant date fair value of stock options granted	$	8.43	$	7.99	$	6.02	$	11.71

Summary of RSU and PSU Activity

	RSUs			PSUs
		Weighted-				Weighted-
		Average				Average
		Grant Date				Grant Date
(unaudited)	Shares	Fair Value		Shares		Fair Value
Unvested as of December 31, 2014	497,020	$	19.40	—		$	—
Granted	580,957		17.55	86,580	(1)		15.71
Vested	(102,407)		17.77	—			—
Forfeited	(76,715)		18.64	—			—
Unvested as of June 30, 2015	898,855	$	18.45	86,580		$	15.71

Schedule of Fair Value and Instrinsic Value of RSUs vested, and the weighted average grant date fair value of RSUs granted for periods presented.

The following table presents the total fair value and the aggregate intrinsic value of RSUs vested and the weighted-average grant date fair value of RSUs granted for the periods presented:

		RSUs
		Three months ended  June 30,				Six months ended June 30,
(In millions, except per share data)		2015	2014			2015	2014
		(unaudited)				(unaudited)
Total fair value of shares vested	$	1.4	$	—	$	1.8	$	—
Total aggregate intrinsic value of shares vested	$	1.60	$	—	$	2.16	$	—
Weighted-average per share grant date fair value of shares granted	$	18.28	$	17.92	$	17.55	$	19.41