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Stock-Based Compensation (Details 1) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jul. 01, 2016
Jun. 30, 2017
Jul. 01, 2016
Schedule of Employee Service Share-based Compensation [Line Items]        
Total stock compensation expense $ 868 $ 300 $ 1,378 $ 7,758
Amounts capitalized as part of inventory 109 36 162 188
Total 977 336 1,540 7,946
Cost of Sales [Member]        
Schedule of Employee Service Share-based Compensation [Line Items]        
Total stock compensation expense 2 0 4 560
General and administrative [Member]        
Schedule of Employee Service Share-based Compensation [Line Items]        
Total stock compensation expense 394 167 658 3,688
Marketing and selling [Member]        
Schedule of Employee Service Share-based Compensation [Line Items]        
Total stock compensation expense 228 68 344 1,471
Research and development [Member]        
Schedule of Employee Service Share-based Compensation [Line Items]        
Total stock compensation expense $ 244 $ 65 $ 372 $ 2,039