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LONG-TERM DEBT - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jan. 11, 2018
Jan. 03, 2017
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Debt Instrument [Line Items]              
Debt discount     $ 3,263,000   $ 3,263,000   $ 3,300,000
Undrawn commitment for a letter of credit     100,000   100,000    
Payment-in-kind interest         2,479,000 $ 2,407,000  
Interest expense     10,776,000 $ 7,630,000 20,139,000 14,559,000  
Amortization related to amortization of deferred finance costs and debt discounts     400,000 $ 300,000 800,000 700,000  
Goldman Sachs Specialty Lending Group | Line of Credit              
Debt Instrument [Line Items]              
Maximum borrowing capacity     $ 422,500,000   $ 422,500,000    
Interest rate during period     10.50%   10.50%   10.50%
Goldman Sachs Specialty Lending Group | Line of Credit | Term Loan              
Debt Instrument [Line Items]              
Maximum borrowing capacity     $ 397,500,000   $ 397,500,000    
Remaining borrowing capacity     80,000,000.0   80,000,000.0    
Payment-in-kind interest         2,500,000 $ 2,400,000  
Goldman Sachs Specialty Lending Group | Line of Credit | Revolving Credit Facility              
Debt Instrument [Line Items]              
Maximum borrowing capacity     25,000,000.0   25,000,000.0    
Line of credit     $ 14,000,000.0   $ 14,000,000.0    
Interest rate during period     7.40%   7.40%    
Syndicate of Lenders | Line of Credit              
Debt Instrument [Line Items]              
Interest rate during period     7.41%   7.41%   7.53%
Quarterly principal payment   $ 1,000,000.0          
Syndicate of Lenders | Line of Credit | LIBOR              
Debt Instrument [Line Items]              
Applicable margin         5.00%   5.00%
Syndicate of Lenders | Line of Credit | Term Loan | LIBOR              
Debt Instrument [Line Items]              
Applicable margin 5.00%            
Syndicate of Lenders | Line of Credit | Term Loan | Base Rate              
Debt Instrument [Line Items]              
Applicable margin 4.00%            
Syndicate of Lenders | Line of Credit | Revolving Credit Facility              
Debt Instrument [Line Items]              
Line of credit             $ 0
Unused commitment fee percentage 0.50%            
Syndicate of Lenders | Line of Credit | Revolving Credit Facility | LIBOR              
Debt Instrument [Line Items]              
Applicable margin 5.00%            
Syndicate of Lenders | Line of Credit | Revolving Credit Facility | Base Rate              
Debt Instrument [Line Items]              
Applicable margin 4.00%            
Delayed Draw | Goldman Sachs Specialty Lending Group | Line of Credit | Term Loan              
Debt Instrument [Line Items]              
Maximum borrowing capacity             70,000,000.0
Debt discount             $ 350,000
Unused commitment fee amount     $ 400,000