Employee Benefit Plans (Tables)

6 Months Ended

Jul. 03, 2016

Employee Benefits and Share-based Compensation [Abstract]

Schedule Of Stock Option Activity

Option Activity

Stock option activity during the six months ended July 3, 2016 was as follows:

	Number of shares		Weighted Average Exercise Price Per Share
	(in thousands)		(in dollars)
Outstanding at December 31, 2015	2,461		$	30.08
Granted	328		39.53
Exercised	(470	)	30.87
Cancelled	(14	)	34.09
Expired	(1	)	34.68
Outstanding at July 3, 2016	2,304		$	31.24

Schedule Of RSU Activity

RSU Activity

RSU activity during the six months ended July 3, 2016 was as follows:

	Number of shares		Weighted Average Grant Date Fair Value Per Share
	(in thousands)		(in dollars)
Outstanding at December 31, 2015	964		$	31.63
RSUs granted	442		40.36
RSUs vested	(299	)	31.25
RSUs cancelled	(66	)	30.82
Outstanding at July 3, 2016	1,041		$	35.50

Schedule Of Valuation And Expense Information

The table below sets forth the weighted average assumptions used to estimate the fair value of option grants during the three and six months ended July 3, 2016 and June 28, 2015 and purchase rights granted under the ESPP commencing February 16, 2016 during the three and six months ended July 3, 2016.

	Three Months Ended			Six Months Ended
	ESPP (1)	Stock Options		ESPP	Stock Options
	July 3, 2016	July 3, 2016	June 28, 2015	July 3, 2016	July 3, 2016	June 28, 2015
Expected life (in years)	N/A	N/A	4.5	0.5	4.4	4.5
Risk-free interest rate	N/A	N/A	1.45%	0.42%	1.28%	1.44%
Expected volatility	N/A	N/A	39.3%	44.7%	35.4%	39.3%
Dividend yield	N/A	N/A	—	—	—	—

(1) No purchase rights were granted under the ESPP during the three months ended July 3, 2016.

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 (in thousands):

	Three Months Ended				Six Months Ended
	July 3, 2016		June 28, 2015		July 3, 2016		June 28, 2015
Cost of revenue	$	451	$	336	$	890	$	832
Research and development	1,118		773		1,984		1,618
Sales and marketing	1,338		1,272		2,535		2,665
General and administrative	2,112		1,677		4,021		3,291
Total stock-based compensation	$	5,019	$	4,058	$	9,430	$	8,406