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Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2019

Employee Benefits And Share Based Compensation [Abstract]

Stock option activity during the year ended December 31, 2019 was as follows:

	Number of Shares			Weighted Average Exercise Price Per Share		Weighted Average Remaining Contractual Term		Aggregate Intrinsic Value
	(In thousands)			(In dollars)		(In years)		(In thousands)
Outstanding as of December 31, 2018		1,969		$	25.30
Granted		502			26.61
Exercised		(250	)		20.08
Cancelled		(16	)		36.27
Expired		(17	)		36.81
Outstanding as of December 31, 2019		2,188		$	26.03		6.10	$	4,171

As of December 31, 2019
Vested and expected to vest		2,188		$	26.03		6.10	$	4,171
Exercisable Options		1,411		$	23.96		4.60	$	4,153

Schedule of Ranges of Outstanding And Exercisable Stock Options

The following table summarizes significant ranges of outstanding and exercisable stock options as of December 31, 2019:

	Options Outstanding						Options Exercisable
Range of Exercise Prices	Shares Outstanding		Weighted- Average Remaining Contractual Life		Weighted- Average Exercise Price Per Share		Shares Exercisable		Weighted- Average Exercise Price Per Share
	(In thousands)		(In years)		(In dollars)		(In thousands)		(In dollars)
$12.34 - $19.32		452		3.86	$	18.82		452	$	18.82
$19.33 - $23.48		559		3.95	$	21.65		542	$	21.59
$23.77 - $25.37		293		6.85	$	25.36		188	$	25.36
$26.61 - $26.61		503		8.91	$	26.61		37	$	26.61
$29.23 - $41.67		381		7.63	$	40.76		192	$	40.80
$12.34 - $41.67		2,188		6.10	$	26.03		1,411	$	23.96

Schedule of RSU Activity

RSU activity during the year ended December 31, 2019 was as follows:

	Number of Shares			Weighted Average Grant Date Fair Value Per Share		Weighted Average Remaining Contractual Term		Average Intrinsic Value
	(In thousands)			(In dollars)		(In years)		(In thousands)
Outstanding as of December 31, 2018		1,627		$	34.31
Granted		709			31.33
Vested		(594	)		31.35
Cancelled		(155	)		35.67
Outstanding as of December 31, 2019		1,587		$	33.95		1.36	$	38,895

Schedule of Weighted Average Assumptions

The following table sets forth the weighted-average assumptions used to estimate the fair value of option grants and purchase rights granted under the ESPP during the years ended December 31, 2019, 2018 and 2017:

	Year Ended December 31,
	2019			2018			2017			2019			2018			2017
	Stock Options									ESPP
Expected life (in years)		6.2			4.4			4.4			0.5			0.5			0.5
Risk-free interest rate		1.85	%		2.36	%		1.66	%		2.06	%		2.00	%		0.93	%
Expected volatility		33.9	%		31.1	%		31.6	%		43.90	%		37.9	%		29.7	%
Dividend yield		—			—			—			—			—			—

Schedule of Total Stock-Based Compensation Expense Resulting from Stock Options, RSUs, and the ESPP

The following table sets forth the stock-based compensation expense resulting from stock options, RSUs, and the ESPP included in the Company’s consolidated statements of operations:

	Year Ended December 31,
	2019		2018		2017
	(In thousands)
Cost of revenue	$	2,843	$	2,435	$	1,406
Research and development		6,532		4,283		2,968
Sales and marketing		9,069		8,267		5,481
General and administrative		10,693		11,476		9,114
Total	$	29,137	$	26,461	$	18,969