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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property and Equipment (Details) - USD ($)
12 Months Ended
Dec. 28, 2016
Dec. 30, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]      
Impairment charges $ 0 $ 0 $ 0
Equipment | Minimum      
Property, Plant and Equipment [Line Items]      
Useful life of asset 3 years    
Equipment | Maximum      
Property, Plant and Equipment [Line Items]      
Useful life of asset 7 years    
Furniture and fixtures | Minimum      
Property, Plant and Equipment [Line Items]      
Useful life of asset 3 years    
Furniture and fixtures | Maximum      
Property, Plant and Equipment [Line Items]      
Useful life of asset 7 years    
Computer equipment and software | Minimum      
Property, Plant and Equipment [Line Items]      
Useful life of asset 3 years    
Computer equipment and software | Maximum      
Property, Plant and Equipment [Line Items]      
Useful life of asset 7 years    
Leasehold improvements | Minimum      
Property, Plant and Equipment [Line Items]      
Useful life of asset 10 years    
Leasehold improvements | Maximum      
Property, Plant and Equipment [Line Items]      
Useful life of asset 20 years