Employee Benefit Plans (Tables)

9 Months Ended

Oct. 02, 2016

Employee Benefits and Share-based Compensation [Abstract]

Schedule Of Stock Option Activity

Option Activity

Stock option activity during the nine months ended October 2, 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	(707	)	31.23
Cancelled	(15	)	34.10
Expired	(2	)	34.37
Outstanding at October 2, 2016	2,065		$	31.16

Schedule Of RSU Activity

RSU Activity

RSU activity during the nine months ended October 2, 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	457		40.65
RSUs vested	(321	)	31.22
RSUs cancelled	(82	)	31.35
Outstanding at October 2, 2016	1,018		$	35.84

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 nine months ended October 2, 2016 and September 27, 2015 and purchase rights granted under the ESPP commencing February 16, 2016 during the three and nine months ended October 2, 2016.

	Three Months Ended			Nine Months Ended
	ESPP	Stock Options		ESPP	Stock Options
	October 2, 2016	October 2, 2016	September 27, 2015	October 2, 2016	October 2, 2016	September 27, 2015
Expected life (in years)	0.5	N/A	N/A	0.5	4.4	4.5
Risk-free interest rate	0.45%	N/A	N/A	0.43%	1.28%	1.44%
Expected volatility	28.6%	N/A	N/A	38.3%	35.4%	39.3%
Dividend yield	—	N/A	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 (in thousands):

	Three Months Ended				Nine Months Ended
	October 2, 2016		September 27, 2015		October 2, 2016		September 27, 2015
Cost of revenue	$	426	$	358	$	1,316	$	1,190
Research and development	1,087		877		3,071		2,495
Sales and marketing	1,300		1,173		3,835		3,838
General and administrative	2,057		1,703		6,078		4,994
Total stock-based compensation	$	4,870	$	4,111	$	14,300	$	12,517