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Employee Benefit Plans (Tables)
3 Months Ended
Apr. 03, 2016
Employee Benefits and Share-based Compensation [Abstract]  
Schedule Of Stock Option Activity
Option Activity
Stock option activity during the three months ended April 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
(128
)
 
28.54

Cancelled
(12
)
 
33.75

Expired
(1
)
 
33.79

Outstanding at April 3, 2016
2,648

 
$
31.31


Schedule Of RSU Activity
RSU Activity

RSU activity during the three months ended April 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
362

 
39.23

RSUs vested
(25
)
 
30.77

RSUs cancelled
(50
)
 
30.19

Outstanding at April 3, 2016
1,251

 
$
33.91

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 commencing February 16, 2016 during the three months ended April 3, 2016 and March 29, 2015.
 
 
ESPP
 
Stock Options
 
Three Months Ended
 
Three Months Ended
 
April 3,
2016
 
March 29,
2015
 
April 3,
2016
 
March 29,
2015
Expected life (in years)
0.5
 
N/A
 
4.4
 
4.4
Risk-free interest rate
0.42%
 
N/A
 
1.28%
 
1.06%
Expected volatility
44.7%
 
N/A
 
35.4%
 
39.9%
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 (in thousands):
 
 
Three Months Ended
 
April 3,
2016
 
March 29,
2015
Cost of revenue
$
439

 
$
496

Research and development
866

 
845

Sales and marketing
1,197

 
1,393

General and administrative
1,909

 
1,614

Total stock-based compensation
$
4,411

 
$
4,348