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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property and Equipment (Details) - USD ($)
12 Months Ended
Dec. 30, 2020
Dec. 25, 2019
Dec. 26, 2018
Property, Plant and Equipment [Line Items]      
Impairment charges $ 7,644,000 $ 0 $ 0
Equipment | Maximum      
Property, Plant and Equipment [Line Items]      
Useful life of property and equipment 7 years    
Equipment | Minimum      
Property, Plant and Equipment [Line Items]      
Useful life of property and equipment 2 years    
Furniture and Fixtures | Maximum      
Property, Plant and Equipment [Line Items]      
Useful life of property and equipment 7 years    
Furniture and Fixtures | Minimum      
Property, Plant and Equipment [Line Items]      
Useful life of property and equipment 2 years    
Computer Equipment and Software | Maximum      
Property, Plant and Equipment [Line Items]      
Useful life of property and equipment 7 years    
Computer Equipment and Software | Minimum      
Property, Plant and Equipment [Line Items]      
Useful life of property and equipment 2 years