Employee Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2019

Employee Benefits and Share-based Compensation, Noncash [Abstract]

Schedule of Stock Option Activity

Stock option activity during the three months ended March 31, 2019 was as follows:

	Number of shares		Weighted Average Exercise Price Per Share
	(In thousands)		(In dollars)
Outstanding as of December 31, 2018	1,969		$	25.30
Exercised	(100	)	$	20.76
Outstanding as of March 31, 2019	1,869		$	25.54

Schedule of RSU Activity

RSU activity during the three months ended March 31, 2019 was as follows:

	Number of shares		Weighted Average Grant Date Fair Value Per Share
	(In thousands)		(In dollars)
Outstanding as of December 31, 2018	1,627		$	34.31
Granted	25		$	39.36
Vested	(255	)	$	34.65
Cancelled	(12	)	$	34.77
Outstanding as of March 31, 2019	1,385		$	34.33

Schedule of Weighted Average Assumptions

The table below sets forth the weighted average assumptions used to estimate the fair value of option grants and purchase rights granted under the ESPP during the three months ended March 31, 2019 and April 1, 2018.

	Three Months Ended
	Stock Options			ESPP
	March 31, 2019	April 1, 2018		March 31, 2019		April 1, 2018
Expected life (in years)	N/A	4.4		0.5		0.5
Risk-free interest rate	N/A	2.32	%	2.49	%	1.81	%
Expected volatility	N/A	30.9	%	42.6	%	37.1	%
Dividend yield	N/A	—		—		—

Schedule of Total Stock-Based Compensation Expense Resulting from Stock Options, Restricted Stock Awards, and the Employee Stock Purchase Plan

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

	Three Months Ended
	March 31, 2019		April 1, 2018
	(In thousands)
Cost of revenue	$	668	$	563
Research and development	1,192		1,012
Sales and marketing	2,041		2,205
General and administrative	2,557		3,084
Total stock-based compensation	$	6,458	$	6,864