Employee Stock Plans (Tables)

12 Months Ended

Dec. 31, 2015

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

Disclosure of Share-based Compensation Arrangements by Share-based Payment Award

Stock-based compensation expense related to all of the Company’s stock awards is included in operating expense categories, as follows:

	Years Ended December 31,
	2015		2014		2013
	(In thousands)
Cost of revenue	$	491	$	523	$	692
Sales and marketing	1,990		1,920		1,320
General and administrative	7,663		6,390		4,998
Product development	1,416		1,551		1,276
Total	$	11,560	$	10,384	$	8,286

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

The following table summarizes the weighted average values of the assumptions used in the Black-Scholes pricing model to estimate the fair value of the stock options granted during the period presented:

	Years Ended December 31,
	2015	2014	2013
Expected volatility	45.1%	51.1%	52.1%
Expected life of option	6.25 years	6.21 years	6.09 years
Risk free interest rate	1.8%	1.9%	1.3%
Expected dividend yield	0.0%	0.0%	0.0%

Schedule of Share-based Compensation, Stock Options, Activity

The following table summarizes non-vested stock option activity for the year ended December 31, 2015:

	Shares		Weighted Average Grant Date Fair Value
Non-vested options outstanding at December 31, 2014	1,862,787		$	3.62
Granted	569,523		5.03
Vested	(1,014,854	)	3.59
Forfeited	(339,104	)	3.75
Non-vested options outstanding at December 31, 2015	1,078,352		$	4.34

The following table summarizes stock option activity for the year ended December 31, 2015:

	Shares		Weighted Average Exercise Price
Outstanding at December 31, 2014	4,688,256		$	6.87
Granted	569,523		10.95
Exercised	(776,293	)	5.31
Forfeited	(402,860	)	9.19
Outstanding at December 31, 2015	4,078,626		$	7.51

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range

The following table contains additional information with respect to options outstanding and exercisable at December 31, 2015:

	Options Outstanding		Options Exercisable
	Number of Options Outstanding	Remaining Weighted Average Life	Number Exercisable	Remaining Weighted Average Life
Exercise Prices:
$1.59 - $4.73	632,802	5.22	527,220	4.95
$5.14 - $7.89	2,184,342	6.23	1,987,882	6.15
$8.08 - $11.91	983,661	8.91	207,351	8.16
$13.00 - $25.89	277,821	4.81	277,821	4.81
	4,078,626		3,000,274

Schedule of Share-based Compensation, Stock Options, Additional Disclosures

The following table provides additional information pertaining to the Company's stock options:

	Years Ended December 31,
	2015		2014		2013
Weighted average grant date fair value for options granted during the period	$	5.03	$	4.86	$	3.55
Total fair value of options vested (in thousands)	$	3,647	$	4,325	$	4,968

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

The following table summarizes RSA activity for the year ended December 31, 2015:

	Shares		Weighted Average Grant Date Fair Value
Non-vested RSAs at December 31, 2014	564,652		$	4.69
Granted	78,448		10.83
Vested and exchanged for common stock	(80,164	)	8.73
Non-vested RSAs at December 31, 2015	562,936		$	4.97

The following table summarizes RSU activity for the year ended December 31, 2015:

	Shares		Weighted Average Grant Date Fair Value
Non-vested RSUs at December 31, 2014	1,765,905		$	8.47
Granted	1,332,404		9.51
Vested	(582,086	)	8.29
Forfeited	(484,021	)	9.25
Non-vested RSUs at December 31, 2015	2,032,202		$	8.97