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STOCK-BASED COMPENSATION - Schedule of Impact on Results of Operations of Recording Stock-based Compensation Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 01, 2017
Jan. 03, 2016
Dec. 28, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Total costs and expenses $ 1,584 $ 2,028 $ 2,242
Cost of revenue      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Total costs and expenses 132 109 137
Research and development      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Total costs and expenses 658 826 924
Selling, general and administrative      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Total costs and expenses 794 1,064 1,181
Restructuring Costs      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Total costs and expenses $ 0 $ 29 $ 0