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SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Jan. 01, 2017
Jan. 03, 2016
Accounting Policies [Abstract]      
Percentage of total operating expenses 25.00% 18.00% 17.00%
Finite-Lived Intangible Assets [Line Items]      
Write-off of equipment $ 12 $ 368 $ 8
Operating loss carryforward 56,000    
Valuation allowance 55,931 79,150  
Selling, General and Administrative Expenses      
Finite-Lived Intangible Assets [Line Items]      
Costs related to advertising and promotion expenditures $ 95 51 60
Licensed Intellectual Property      
Finite-Lived Intangible Assets [Line Items]      
Estimated useful life (up to) 5 years    
Minimum      
Finite-Lived Intangible Assets [Line Items]      
Estimated useful life 1 year    
Minimum | Assets Held under Capital Leases      
Finite-Lived Intangible Assets [Line Items]      
Estimated useful life 1 year    
Maximum      
Finite-Lived Intangible Assets [Line Items]      
Estimated useful life 7 years    
Maximum | Assets Held under Capital Leases      
Finite-Lived Intangible Assets [Line Items]      
Estimated useful life 7 years    
Allowance for sales returns      
Finite-Lived Intangible Assets [Line Items]      
Valuation allowances and reserves   $ 93 $ 19