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Employee Benefit Plans (Tables)
6 Months Ended
Jul. 02, 2017
Employee Benefits and Share-based Compensation [Abstract]  
Schedule Of Stock Option Activity

Option Activity

Stock option activity during the six months ended July 2, 2017 was as follows:
 
Number of shares
 
Weighted Average Exercise Price Per Share
 
(In thousands)
 
(In dollars)
Outstanding as of December 31, 2016
1,884

 
$
31.14

Granted
328

 
42.70

Exercised
(142
)
 
27.84

Cancelled

 

Expired
(1
)
 
30.66

Outstanding as of July 2, 2017
2,069

 
$
33.20

Schedule Of RSU Activity

RSU Activity

RSU activity during the six months ended July 2, 2017 was as follows:
 
Number of shares
 
Weighted Average Grant Date Fair Value Per Share
 
(In thousands)
 
(In dollars)
Outstanding as of December 31, 2016
996

 
$
36.22

Granted
544

 
49.59

Vested
(361
)
 
34.99

Cancelled
(28
)
 
44.61

Outstanding as of July 2, 2017
1,151

 
$
42.72


Schedule Of Valuation And Expense Information

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 2, 2017 and July 3, 2016.
 
Three Months Ended
 
Six Months Ended
 
Stock Options
 
ESPP
 
Stock Options
 
ESPP
 
July 2,
2017
 
July 3,
2016
 
July 2,
2017
 
July 3,
2016
 
July 2,
2017
 
July 3,
2016
 
July 2,
2017
 
July 3,
2016
Expected life (in years)
4.4

 
NA
 
NA
 
NA
 
4.4

 
4.4

 
0.5

 
0.5

Risk-free interest rate
1.65
%
 
NA
 
NA
 
NA
 
1.65
%
 
1.28
%
 
0.66
%
 
0.42
%
Expected volatility
31.6
%
 
NA
 
NA
 
NA
 
31.6
%
 
35.4
%
 
27.6
%
 
44.7
%
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 2,
2017
 
July 3,
2016
 
July 2,
2017
 
July 3,
2016
 
(In thousands)
Cost of revenue
$
542

 
$
451

 
$
978

 
$
890

Research and development
1,373

 
1,118

 
2,692

 
1,984

Sales and marketing
1,438

 
1,338

 
2,685

 
2,535

General and administrative
2,348

 
2,112

 
4,474

 
4,021

Total stock-based compensation
$
5,701

 
$
5,019

 
$
10,829

 
$
9,430