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Stockholders' Equity (Details 2) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 29, 2017
Dec. 30, 2016
Jan. 01, 2016
Schedule Of Employee Service Share based Compensations [Line Items]      
Total stock-based compensation expense $ 3,161 $ 8,558 $ 3,304
Amounts capitalized as part of inventory 372 269 516
Total stock-based compensation 3,533 8,827 3,820
Cost of Sales [Member]      
Schedule Of Employee Service Share based Compensations [Line Items]      
Total stock-based compensation expense 8 612 52
General and Administrative Expense [Member]      
Schedule Of Employee Service Share based Compensations [Line Items]      
Total stock-based compensation expense 1,487 3,809 2,090
Marketing and selling [Member]      
Schedule Of Employee Service Share based Compensations [Line Items]      
Total stock-based compensation expense 805 1,961 696
Research and Development Expense [Member]      
Schedule Of Employee Service Share based Compensations [Line Items]      
Total stock-based compensation expense $ 861 $ 2,176 $ 466