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SUBSEQUENT EVENTS (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 02, 2018
Dec. 31, 2017
Jan. 01, 2017
Jan. 03, 2016
Aug. 31, 2017
Subsequent Event [Line Items]          
Repayment of line of credit   $ 18,000 $ 0 $ 0  
Rent payable   $ 900      
Silicon Valley Bank | Revolving Line of Credit          
Subsequent Event [Line Items]          
Interest rate         4.31%
Silicon Valley Bank | Revolving Line of Credit | Subsequent Event          
Subsequent Event [Line Items]          
Repayment of line of credit $ 6,000