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Stock-Based Compensation (Details 1) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 29, 2018
Jun. 30, 2017
Jun. 29, 2018
Jun. 30, 2017
Schedule of Employee Service Share-based Compensation [Line Items]        
Total stock-based compensation expense $ 1,598 $ 868 $ 2,899 $ 1,378
Amounts capitalized as part of inventory 145 110 267 162
Total stock-based compensation 1,743 978 3,166 1,540
Cost of Sales [Member]        
Schedule of Employee Service Share-based Compensation [Line Items]        
Total stock-based compensation expense 4 2 7 4
General and administrative [Member]        
Schedule of Employee Service Share-based Compensation [Line Items]        
Total stock-based compensation expense 655 394 1,174 658
Marketing and selling [Member]        
Schedule of Employee Service Share-based Compensation [Line Items]        
Total stock-based compensation expense 366 228 826 344
Research and development [Member]        
Schedule of Employee Service Share-based Compensation [Line Items]        
Total stock-based compensation expense $ 573 $ 244 $ 892 $ 372