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Employee Benefit Plans (Tables)

6 Months Ended

Jul. 01, 2018

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

Stock option activity during the six months ended July 1, 2018 was as follows:



	Number of shares		Weighted Average Exercise Price Per Share
	(In thousands)		(In dollars)
Outstanding as of December 31, 2017	1,879		$	34.08
Granted	348		70.15
Exercised	(123	)	23.58
Cancelled	—		—
Expired	(5	)	20.07
Outstanding as of July 1, 2018	2,099		$	40.71

Schedule of RSU Activity

RSU activity during the six months ended July 1, 2018 was as follows:



	Number of shares		Weighted Average Grant Date Fair Value Per Share
	(In thousands)		(In dollars)
Outstanding as of December 31, 2017	1,130		$	43.22
Granted	855		67.60
Vested	(392	)	40.77
Cancelled	(23	)	51.53
Outstanding as of July 1, 2018	1,570		$	56.99

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 and six months ended July 1, 2018 and July 2, 2017.



	Three Months Ended					Six Months Ended
	Stock Options			ESPP		Stock Options				ESPP
	July 1, 2018	July 2, 2017		July 1, 2018	July 2, 2017	July 1, 2018		July 2, 2017		July 1, 2018		July 2, 2017
Expected life (in years)	NA	4.4		NA	NA	4.4		4.4		0.5		0.5
Risk-free interest rate	NA	1.65	%	NA	NA	2.32	%	1.65	%	1.81	%	0.66	%
Expected volatility	NA	31.6	%	NA	NA	30.9	%	31.6	%	37.1	%	27.6	%
Dividend yield	NA	—		NA	NA	—		—		—		—

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				Six Months Ended
	July 1, 2018		July 2, 2017		July 1, 2018		July 2, 2017
	(In thousands)
Cost of revenue	$	866	$	542	$	1,718	$	978
Research and development	1,949		1,373		3,524		2,692
Sales and marketing	2,588		1,438		5,119		2,685
General and administrative	3,567		2,348		6,759		4,474
Total stock-based compensation	$	8,970	$	5,701	$	17,120	$	10,829