Annual report pursuant to Section 13 and 15(d)

LONG-TERM DEBT AND WARRANT LIABILITY - Interest Expense and Amortization of Deferred Loan Costs and Discounts Narrative (Details)

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LONG-TERM DEBT AND WARRANT LIABILITY - Interest Expense and Amortization of Deferred Loan Costs and Discounts Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]                      
Less interest expense $ 9,385 $ 13,471 $ 11,668 $ 10,315 $ 10,051 $ 10,463 $ 10,776 $ 9,363 $ 44,839 $ 40,653 $ 29,900
Amortization of debt issuance costs and discounts                 $ 2,400 1,700 $ 1,400
Term Loan | Delayed Draw | Goldman Sachs Specialty Lending Group | Line of Credit                      
Debt Instrument [Line Items]                      
Line of credit facility, commitment fee amount                   $ 400  
Maximum borrowing capacity               $ 70,000