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Stock-Based Compensation (Details 1) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Oct. 02, 2015
Oct. 03, 2014
Oct. 02, 2015
Oct. 03, 2014
Schedule of Employee Service Share-based Compensation [Line Items]        
Total stock compensation expense $ 1,053 $ 1,684 $ 3,005 $ 5,015
Amounts capitalized as part of inventory 130 131 258 279
Total 923 1,553 2,747 4,736
Cost of Sales [Member]        
Schedule of Employee Service Share-based Compensation [Line Items]        
Total stock compensation expense 9 32 33 77
General and administrative [Member]        
Schedule of Employee Service Share-based Compensation [Line Items]        
Total stock compensation expense 543 837 1,667 2,848
Marketing and selling [Member]        
Schedule of Employee Service Share-based Compensation [Line Items]        
Total stock compensation expense 184 326 539 906
Research and development [Member]        
Schedule of Employee Service Share-based Compensation [Line Items]        
Total stock compensation expense $ 187 $ 358 $ 508 $ 905