Stock-Based Awards (Tables)

12 Months Ended

Dec. 31, 2016

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

The following table summarizes the stock option activity which contain only service conditions, under the Company’s 1999, 2009 and 2010 Plans (in thousands, except per share and term information):



	Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term	Aggregate Intrinsic Value
Outstanding, December 31, 2015	7,264		$	30.75	7.1	$	63,328
Granted	101		38.67
Exercised	(978	)	19.33
Forfeited	(346	)	43.17
Outstanding, December 31, 2016	6,041		32.01		6.2	74,989
Exercisable at December 31, 2016	4,899		29.76		5.9	71,182
Vested and expected to vest at December 31, 2016	5,999		$	31.95	6.2	$	74,816

Schedule of stock options outstanding and exercisable

The following table summarizes information about stock options, which contain only service conditions, under the Company’s equity incentive plans at December 31, 2016 (in thousands except term information):



	Options Outstanding at December 31, 2016		Options Exercisable at December 31, 2016
	Number of Options	Weighted Average Remaining Contractual Term (in years)	Number of Options	Weighted Average Remaining Contractual Term (in years)
Range of Exercise Prices
$0.34 to $1.65	194	2.3	194	2.3
$5.93 to $8.88	813	3.9	813	3.9
$12.54 to $15.41	168	4.7	168	4.7
$16.24 to $18.82	340	5.0	340	5.0
$20.85 to $23.94	618	5.4	618	5.4
$27.55 to $31.44	263	6.5	222	6.2
$31.64 to $36.15	922	7.7	554	7.2
$38.03 to $45.76	1,220	7.1	899	6.9
$46.20 to $56.05	1,503	7.1	1,091	7.1
	6,041	6.2	4,899	5.9

Schedule of restricted stock unit activity

Restricted stock unit activity for the year ended December 31, 2016 under the Company’s equity incentive plans is summarized as follows (shares in thousands):



	Number of Shares		Weighted Average Grant Date Fair Value
Nonvested shares subject to restricted stock units outstanding at December 31, 2015	2,460		$	34.71
Granted	1,859		37.49
Forfeited	(367	)	34.63
Vested	(698	)	34.50
Nonvested shares subject to restricted stock units outstanding at December 31, 2016	3,254		$	36.35

Summary of stock-based compensation expense

Stock-based compensation expense related to stock options, restricted stock units, the ESPP and performance-based restricted stock units is included in the following line items in the accompanying Consolidated Statement of Operations for the years ended December 31, 2016, 2015, and 2014 (in thousands):



	Years Ended December 31,
	2016		2015		2014
Cost of revenue	$	4,732	$	3,887	$	2,669
Sales and marketing	25,642		23,604		18,364
Research and development	7,586		6,010		3,551
General and administrative	16,739		9,580		9,096
Total	$	54,699	$	43,081	$	33,680