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OBLIGATIONS - Revolving Line of Credit (Details)
Aug. 31, 2017
USD ($)
Sep. 25, 2015
USD ($)
Dec. 31, 2017
USD ($)
Jan. 01, 2017
USD ($)
Line of Credit Facility [Line Items]        
Revolving debt outstanding     $ 6,000,000 $ 6,000,000
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 $ 6,000,000.0    
Amount of increase in company in company election (up to)   $ 12,000,000.0    
Extended period of line of credit 1 year      
Unrestricted cash or cash equivalents (at least) $ 6,000,000      
Long-term portion of obligations (at least) 1.40      
Revolving debt outstanding     $ 6,000,000  
Interest rate 4.31%