Annual report pursuant to Section 13 and 15(d)

LONG-TERM DEBT, SUBSEQUENT EVENT AND COMMON STOCK WARRANT LIABILITY - Prior Credit Facilities Narrative (Details)

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LONG-TERM DEBT, SUBSEQUENT EVENT AND COMMON STOCK WARRANT LIABILITY - Prior Credit Facilities Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Term Loan | Capital One Bank | First Lien Credit Agreement    
Debt Instrument [Line Items]    
Maximum borrowing capacity $ 45,000,000  
Term Loan | Abc Funding LLC | Second Lien Credit Agreement    
Debt Instrument [Line Items]    
Maximum borrowing capacity 55,000,000 $ 20,000,000
Proceeds from issuance of debt 35,000,000  
Revolving Credit Facility | Capital One Bank | First Lien Credit Agreement    
Debt Instrument [Line Items]    
Maximum borrowing capacity $ 2,000,000  
Line of Credit | Capital One Bank | First Lien Credit Agreement    
Debt Instrument [Line Items]    
Minimum base rate 1.00%  
Applicable margin rate 4.25%  
Line of Credit | Term Loan | Abc Funding LLC | Second Lien Credit Agreement    
Debt Instrument [Line Items]    
Interest rate 13.50%  
Prepayment penalty 2.00%