Annual report pursuant to Section 13 and 15(d)

LONG-TERM DEBT AND WARRANT LIABILITY - Debt Extinguishment and Debt Modification Expenses Narrative (Details)

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LONG-TERM DEBT AND WARRANT LIABILITY - Debt Extinguishment and Debt Modification Expenses Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Sep. 25, 2020
Sep. 30, 2020
Mar. 31, 2020
Dec. 31, 2018
Jan. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]                
Amortization of debt issuance costs and discounts           $ 2,396 $ 1,667 $ 1,418
Syndicate of Lenders | Line of Credit                
Debt Instrument [Line Items]                
Debt prepayment $ 106,500 $ 106,500            
Debt prepayment cost, unamortized loan costs and discount expensed           $ 1,500    
Term Loan | Syndicate of Lenders | Line of Credit                
Debt Instrument [Line Items]                
Amortization of debt issuance costs and discounts     $ 400 $ 1,200 $ 800