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Stock-Based Compensation (Details 1) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Apr. 01, 2016
Schedule of Employee Service Share-based Compensation [Line Items]    
Total stock compensation expense $ 510 $ 7,458
Amounts capitalized as part of inventory 52 152
Total 562 7,610
Cost of Sales [Member]    
Schedule of Employee Service Share-based Compensation [Line Items]    
Total stock compensation expense 2 560
General and administrative [Member]    
Schedule of Employee Service Share-based Compensation [Line Items]    
Total stock compensation expense 264 3,394
Marketing and selling [Member]    
Schedule of Employee Service Share-based Compensation [Line Items]    
Total stock compensation expense 116 1,531
Research and development [Member]    
Schedule of Employee Service Share-based Compensation [Line Items]    
Total stock compensation expense $ 128 $ 1,973