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Stock-Based Compensation (Details 1) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 30, 2018
Mar. 31, 2017
Schedule of Employee Service Share-based Compensation [Line Items]    
Total stock-based compensation expense $ 1,301 $ 510
Amounts capitalized as part of inventory 122 52
Total stock-based compensation 1,423 562
Cost of Sales [Member]    
Schedule of Employee Service Share-based Compensation [Line Items]    
Total stock-based compensation expense 3 2
General and administrative [Member]    
Schedule of Employee Service Share-based Compensation [Line Items]    
Total stock-based compensation expense 519 264
Marketing and selling [Member]    
Schedule of Employee Service Share-based Compensation [Line Items]    
Total stock-based compensation expense 460 116
Research and development [Member]    
Schedule of Employee Service Share-based Compensation [Line Items]    
Total stock-based compensation expense $ 319 $ 128