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Equity and Stock Based Compensation Plans (Tables)
 3 Months Ended
Mar. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Assumption of stock option's fair value
 
Three Months Ended
 
March 30,
2013
 
March 31,
2012
Stock Options
 
 
 
Expected life
4.5 years

 
4.6 years

Volatility
73.12
%
 
78.13
%
Risk free interest rate
0.86
%
 
0.88
%
Dividends
—

 
—

Employee Stock Purchase Plan
 
 
 
Expected life
0.5 years

 
0.5 years

Volatility
27.61
%
 
55.93
%
Risk free interest rate
0.11
%
 
0.06
%
Dividends
—

 
—
Stock-based compensation expense for all share-based payment awards
 
Three Months Ended
 
March 30,
2013

March 31,
2012
Cost of products
$
45

 
$
57

Cost of service
59

 
58

Research and development
317

 
319

Selling
440

 
441

General and administrative
596

 
586

Total stock-based compensation expense
$
1,457

 
$
1,461
Changes in accumulated other comprehensive income by component
 
Defined Benefit Pension Plans
 
Foreign Currency Translations
 
Unrealized Gain (Loss) on Investment
 
Total
Balance as of December 29, 2012
$
(179
)
 
$
1,453

 
$
(2
)
 
$
1,272

Other comprehensive income before reclassifications
—

 
(1,944
)
 
5

 
(1,939
)
Amounts reclassified from accumulated other comprehensive income
—

 
—

 
—

 
—

Net current-period other comprehensive income
—

 
(1,944
)
 
5

 
(1,939
)
Balance as of March 30, 2013
$
(179
)
 
$
(491
)
 
$
3

 
$
(667
)
Stock Options [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Stock option plans activity
 
Number of
Shares
Outstanding
(Options)
 
Weighted
Average
Exercise
Price
 
Weighted
Average
Remaining
Contractual Term (Years)
 
Aggregate Intrinsic Value (in Thousands)
Options
 
 
 
 
 
 
 
Outstanding at December 29, 2012
2,020,319

 
$
12.01

 
4.44

 
$
6,770

Exercised
(105,843
)
 
7.79

 
 
 
 
Granted
254,300

 
15.52

 
 
 
 
Cancelled
(29,650
)
 
13.45

 
 
 
 
Outstanding at March 30, 2013
2,139,126

 
$
12.62

 
4.43

 
$
6,142

Exercisable at March 30, 2013
1,205,776

 
$
10.65

 
3.55

 
$
5,438
Restricted Stock Units (RSUs) [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Stock option plans activity

Number
of RSUs
 
Weighted
Average Fair
Value
Outstanding RSU as of December 29, 2012
235,162

 
$
16.32

Granted
218,480

 
15.74

Released
(14,168
)
 
14.83

Cancelled
—

 
—

Outstanding RSU as of March 30, 2013
439,474

 
$
16.08