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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 29, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Assumption of stock option's fair value
The weighted-average fair value calculations are based on the following average assumptions:
 
Fiscal Year
2012
 
Fiscal Year
2011
 
Fiscal Year
2010
Stock Options:
 
 
 
 
 
Expected life
4.5 years
 
4.5 years
 
4.5 years
Volatility
77.3%
 
77.0%
 
74.2%
Risk free interest rate
0.80%
 
1.82%
 
2.04%
Dividends
—
 
—
 
—
Employee Stock Purchase Plan:
 
 
 
 
 
Expected life
0.5 years
 
0.5 years
 
0.5 years
Volatility
45.5%
 
73.4%
 
80.3%
Risk free interest rate
0.12%
 
0.19%
 
0.20%
Dividends
—
 
—
 
—
Significant ranges of outstanding and exercisable options
The following table summarizes significant ranges of outstanding and exercisable options as of December 29, 2012.
Exercise Prices
Options Outstanding
 
Options Exercisable
Number
Outstanding
 
Weighted 
Average
Remaining
Contractual Life
(Years)
 
Weighted
Average
Exercise
Price
 
Number
Exercisable
 
Weighted
Average
Exercise
Price
$0.93-$2.71
212,592

 
2.75

 
$
1.35

 
212,592

 
$
1.35

$5.25-$7.50
229,259

 
3.48

 
$
7.13

 
229,259

 
$
7.13

$7.78-$10.21
152,130

 
2.81

 
$
9.26

 
121,151

 
$
9.18

$10.46-$10.46
206,280

 
4.30

 
$
10.46

 
106,756

 
$
10.46

$10.83-$11.37
212,518

 
4.79

 
$
11.30

 
123,872

 
$
11.25

$11.63-$15.21
205,997

 
5.04

 
$
13.74

 
87,966

 
$
13.12

$15.31-$16.16
213,464

 
4.52

 
$
15.85

 
141,573

 
$
15.92

$16.41-$16.59
26,400

 
5.46

 
$
16.52

 
10,077

 
$
16.52

$16.70-$16.70
351,079

 
5.22

 
$
16.70

 
145,755

 
$
16.70

$17.23-$19.84
210,600

 
6.01

 
$
18.35

 
44,455

 
$
18.53

$0.93-$19.84
2,020,319

 
4.44

 
$
12.01

 
1,223,456

 
$
10.11
Stock-based compensation expense for all share-based payment awards
Stock-based compensation expense for all share-based payment awards made to the Company’s employees and directors pursuant to the employee stock option and employee stock purchase plans by function were as follows (in thousands): 
 
Fiscal Year
2012
 
Fiscal Year
2011
 
Fiscal Year
2010
Cost of products
$
164

 
$
176

 
$
126

Cost of service
230

 
218

 
206

Research and development
1,220

 
984

 
514

Selling
1,791

 
1,366

 
596

General and administrative
2,485

 
1,729

 
1,508

Total stock-based compensation expense related to employee stock options and employee stock purchases
$
5,890

 
$
4,473

 
$
2,950
Stock Options and Restricted Stock Units [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Stock option plans activity
A summary of activity under the Company’s stock option plans including options and RSUs during fiscal year 2012, and shares available for grant at December 29, 2012 is as follows:
 
Shares Available for Grant
(Options and RSUs)
Options and RSUs
 
Shares available for grant at December 31, 2011
1,391,930

Options granted
(281,085
)
Options cancelled
139,376

RSUs granted
(103,554
)
RSUs canceled
—

       Plan shares expired
(53,102
)
Shares available for grant at December 29, 2012
1,093,565
Stock Options [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Stock option plans activity
A summary of activity of stock options in 2012 is as follows:
 
 
Number of
Shares
Outstanding
(Options)
 
Weighted
Average
Exercise
Price
 
Weighted
Average
Remaining
Contractual Term (Years)
 
Aggregate Intrinsic Value (in Thousands)
Options
 
 
 
 
 
 
 
Outstanding at December 31, 2011
2,348,162

 
$
10.53

 
4.86

 
—

Exercised
(469,552
)
 
6.52

 
—

 
—

Granted
281,085

 
16.74
 
—

 
—

Cancelled
(139,376
)
 
15.07
 
—

 
—

Outstanding at December 29, 2012
2,020,319

 
$
12.01

 
4.44

 
$
6,770

Exercisable at December 29, 2012
1,223,456

 
$
10.11

 
3.81

 
$
5,931
Restricted Stock Units (RSUs) [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Stock option plans activity
A summary of activity for RSUs is as follows:
 
RSU
Number
of RSU
Weighted
Average Fair
Value as of December 29, 2012
Outstanding RSU as of December 31, 2011
300,058

$
15.30

Granted
51,777

17.79

Released
(116,673
)
14.88

Cancelled
—

—

Outstanding RSU as of December 29, 2012
235,162

$
16.32