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LONG-TERM DEBT AND WARRANT LIABILITY - Second Amendment in January 2018 Narrative (Details) - USD ($)
12 Months Ended
Dec. 24, 2018
Jan. 11, 2018
Jan. 03, 2017
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]          
Debt discount     $ 3,700,000 $ 3,300,000 $ 3,212,000
Debt issuance costs incurred $ 1,300,000     $ 800,000  
Capitalized incremental deferred finance costs 100,000 $ 300,000      
Capitalized lender fees   400,000      
Syndicate of Lenders | Line of Credit          
Debt Instrument [Line Items]          
Maximum borrowing capacity 422,500,000 292,500,000 225,000,000.0    
Syndicate of Lenders | Term Loan | Line of Credit          
Debt Instrument [Line Items]          
Additional borrowings 60,000,000.0 67,500,000      
Debt discount 300,000 400,000      
Face amount of debt $ 327,500,000 $ 267,500,000 $ 200,000,000.0    
Syndicate of Lenders | Term Loan | Line of Credit | LIBOR          
Debt Instrument [Line Items]          
Applicable margin   5.00% 6.00%    
Syndicate of Lenders | Term Loan | Line of Credit | Base Rate          
Debt Instrument [Line Items]          
Applicable margin   4.00% 5.00%    
Syndicate of Lenders | Revolving Credit Facility | Line of Credit          
Debt Instrument [Line Items]          
Unused commitment fee percentage   0.50% 0.50%    
Maximum borrowing capacity   $ 25,000,000.0 $ 25,000,000.0    
Syndicate of Lenders | Revolving Credit Facility | Line of Credit | LIBOR          
Debt Instrument [Line Items]          
Applicable margin   5.00% 6.00%    
Syndicate of Lenders | Revolving Credit Facility | Line of Credit | Base Rate          
Debt Instrument [Line Items]          
Applicable margin   4.00% 5.00%