Stockholder's Equity and Stock Based Compensation (Tables)

12 Months Ended

Dec. 31, 2015

Stockholder's Equity and Stock Based Compensation

Summary of stock option activity

	Number of Stock Options Outstanding (in thousands)			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Life (in years)		Aggregate Intrinsic Value (in thousands)
Balance as of December 31, 2014		5,404		$	11.55
Granted		65			29.12
Exercised		(1,292	)		4.64
Options Cancelled/Forfeited		(400	)		17.81
Balance as of December 31, 2015		3,777		$	13.55		6.61	$	65,915
Exercisable as of December 31, 2015		3,234		$	9.77		6.34	$	65,435
Vested and expected to vest as of December 31, 2015		3,655		$	13.20		6.57	$	64,761

Schedule of weighted average grant date fair value of options granted and the total intrinsic value of options exercised

	Year Ended December 31,
	2015		2014		2013
Weighted average grant date fair value	$	12.44	$	20.72	$	5.08
Total intrinsic value of options exercised (in thousands)	$	31,938	$	47,273	$	38,241

Schedule of information regarding options outstanding

						Options Outstanding
										Options Exercisable
						Weighted Average Remaining Contractual Term (in years)
Range of Exercise Prices				Number of Shares Outstanding (in thousands)				Weighted Average Exercise Price		Shares Exercisable (in thousands)		Weighted Average Exercise Price
$	0.12	$	1.50		460		4.11	$	1.17		460	$	1.17
	2.38		4.24		390		5.36		2.74		390		2.74
	4.56		4.56		626		6.29		4.56		611		4.56
	4.74		5.44		142		6.49		4.79		142		4.79
	7.42		7.42		1,011		6.97		7.42		1,011		7.42
	9.24		31.67		463		8.25		23.05		273		18.32
	32.65		32.99		45		3.79		32.83		35		32.88
	40.50		40.50		255		8.07		40.50		122		40.50
	41.40		41.40		158		8.08		41.40		76		41.40
	41.91		41.91		227		7.73		41.91		114		41.91
$	0.12	$	41.91		3,777		6.61	$	13.55		3,234	$	9.77

Schedule of assumptions used for estimation of fair value of options granted to employees

	Year Ended December 31,
	2015	2014	2013
Expected term (in years)	6	6	6
Risk-free interest rate	1.55% - 1.87%	1.80% - 1.97%	0.86% - 1.78%
Expected volatility	43% - 45%	49% - 56%	57% - 58%
Expected dividend rate	0%	0%	0%

Summary of Restricted Stock Units RSUs activity

	Number of RSUs (in thousands)			Weighted Average Grant Date Fair Value
Balance as of December 31, 2014		2,360		$	33.30
RSUs Granted		2,017			31.99
RSUs Vested		(633	)		33.18
RSUs Cancelled/Forfeited		(707	)		31.65
Balance as of December 31, 2015		3,037		$	32.84

Schedule of weighted average grant date fair value of RSU and the total intrinsic value of RSU vested

	Year Ended December 31,
	2015		2014		2013
Weighted average grant date fair value	$	31.99	$	34.27	$	28.69
Total intrinsic value of vested RSUs (in thousands)	$	18,172	$	7,117	$	2,479

Schedule of market performance based compensation restricted stock units (MSU) award activity

	Number of Shares Underlying MSUs			Weighted Average Grant Date Fair Value
	(in thousands)
Balance as of December 31, 2014		—		$	—
MSUs Granted		240			37.53
MSUs Cancelled/Forfeited		(47	)		37.53
Balance as of December 31, 2015		193		$	37.53

Schedule of weighted average assumptions used to estimate fair value of market performance based compensation restricted stock units (MSU) awards

	For the Year Ended December 31, 2015
Expected term (in years)		3
Risk-free interest rate		0.99	%
Expected volatility		39	%
Expected dividend rate		0	%

Schedule of assumptions used to value employee stock purchase rights under the Black-Scholes model

	Year Ended December 31,
	2015	2014	2013
Expected term (in months)	6	6 - 9	9
Risk-free interest rate	0.05% - 0.24%	0.05% - 0.11%	0.11%
Expected volatility	31% - 43%	41% - 43%	42%
Expected dividend rate	0%	0%	0%

Schedule of stock-based compensation expense included in operating results

	Year Ended December 31,
	2015		2014		2013
	(in thousands)
Cost of subscription and support revenue	$	2,691	$	1,626	$	496
Cost of professional services and other revenue		4,320		2,363		690
Research and development		7,637		5,353		2,084
Sales and marketing		12,655		8,860		2,293
General and administrative		11,879		6,918		2,512
Total stock-based compensation expense	$	39,182	$	25,120	$	8,075

Schedule of total unrecognized compensation cost related to unvested awards not yet recognized under all equity compensation plans, adjusted for estimate forfeitures

	December 31, 2015
	Unrecognized Expense		Weighted Average Expected Recognition Period
	(in thousands)		(in years)
Stock options	$	10,550		1.36
Restricted stock units and market stock units		66,546		2.79
Employee stock purchase plan		209		0.13
Total unrecognized stock-based compensation expense	$	77,305		2.59