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NOTES PAYABLE - Narrative (Details)
1 Months Ended 9 Months Ended
Jan. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Notes Payable (Details) [Line Items]        
Long-term line of credit     $ 4,000,000 $ 0
Remaining borrowing capacity     $ 1,000,000 $ 5,000,000
Periodic Payment One        
Notes Payable (Details) [Line Items]        
Periodic payment   $ 263,000    
Periodic payment, additional fee   0.25%    
Periodic Payment Two        
Notes Payable (Details) [Line Items]        
Periodic payment   $ 656,000    
Periodic payment, additional fee   0.625%    
Periodic Payment Three        
Notes Payable (Details) [Line Items]        
Periodic payment   $ 1,313,000    
Periodic payment, additional fee   1.25%    
Revolving Credit Facility | Leverage Ratio Period One | Second Restated Credit Agreement        
Notes Payable (Details) [Line Items]        
Fixed charge coverage ratio, not less than   1.25    
Revolving Credit Facility | Leverage Ratio Period Two | Consent And Amendment No. 2        
Notes Payable (Details) [Line Items]        
Leverage ratio 6.00   6.00  
Revolving Credit Facility | Revolving Credit Facility        
Notes Payable (Details) [Line Items]        
Waived intercompany loan debt limit     $ 3,000,000  
Revolving Credit Facility | Revolving Credit Facility | Second Restated Credit Agreement        
Notes Payable (Details) [Line Items]        
Maximum borrowing capacity   $ 175,000,000    
Accordion feature   40,000,000    
Revolving Credit Facility | Revolving Credit Facility | Consent And Amendment No. 2        
Notes Payable (Details) [Line Items]        
Maximum borrowing capacity $ 8,000,000      
Revolving Credit Facility | Medium-term Notes | Second Restated Credit Agreement        
Notes Payable (Details) [Line Items]        
Maximum borrowing capacity   105,000,000    
Revolving Credit Facility | Medium-term Notes | Second Restated Credit Agreement Delayed Draw Term Loan        
Notes Payable (Details) [Line Items]        
Maximum borrowing capacity   25,000,000    
Revolving Credit Facility | Line of Credit | Second Restated Credit Agreement        
Notes Payable (Details) [Line Items]        
Maximum borrowing capacity   $ 5,000,000