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Stockholders' Equity (Details 1) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 01, 2016
Jan. 02, 2015
Jan. 03, 2014
Schedule of Employee Service Share-based Compensation [Line Items]      
Total stock-based compensation expense $ 3,304 $ 4,663 $ 4,489
Amounts capitalized as part of inventory 516 306 232
Total stock-based compensation 3,820 4,969 4,721
Cost of Sales [Member]      
Schedule of Employee Service Share-based Compensation [Line Items]      
Total stock-based compensation expense 52 108 77
General and administrative [Member]      
Schedule of Employee Service Share-based Compensation [Line Items]      
Total stock-based compensation expense 2,090 2,552 2,586
Marketing and selling [Member]      
Schedule of Employee Service Share-based Compensation [Line Items]      
Total stock-based compensation expense 696 1,065 1,167
Research and development [Member]      
Schedule of Employee Service Share-based Compensation [Line Items]      
Total stock-based compensation expense $ 466 $ 938 $ 659