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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 02, 2016
Jul. 04, 2015
Jul. 02, 2016
Jul. 04, 2015
Selling, General and Administrative Expenses [Member]        
Non-cash share-based compensation expense $ 56 $ 145 $ 189 $ 446