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OBLIGATIONS - Revolving Line of Credit (Details)
Sep. 25, 2015
USD ($)
Jan. 03, 2016
USD ($)
Dec. 28, 2014
USD ($)
Line of Credit Facility [Line Items]      
Revolving debt outstanding   $ 2,000,000 $ 1,000,000
Revolving Line of Credit | Silicon Valley Bank      
Line of Credit Facility [Line Items]      
Line of credit extension period 2 years    
Revolving line of credit (up to) $ 6,000,000.0    
Amount of increase in company in company election (up to) 12,000,000.0    
Revolving debt outstanding   $ 2,000,000  
Interest rate   3.38%  
Tangible net worth (at least) $ 12,000,000    
Percentage of proceeds from equity issuance 0.5    
Percentage of proceeds from investments 0.5    
Unrestricted cash or cash equivalents (at least) $ 6,000,000    
Long-term portion of obligations (at least) 1.1