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LONG-TERM DEBT - Recognition, Use of Proceeds and Debt Issuance Costs, Additional Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]      
Fair value adjustment of warrants $ 23,800    
Debt issuance costs, net 5,100    
Warrant issuance cost 1,400    
Repayments of debt 128,800    
Fee amount 2,600    
Loss on debt extinguishment and modification 2,224 $ 279 $ 0
Amount recorded as equity reacquisition costs 400    
Revolving Credit Facility      
Debt Instrument [Line Items]      
Unamortized debt issuance costs 2,200    
Term Loan      
Debt Instrument [Line Items]      
Debt instrument, fair value 218,700    
Convertible debt      
Debt Instrument [Line Items]      
Debt instrument, fair value 121,800    
Repayments of debt 135,500    
Unamortized debt issuance costs 1,440 $ 4,756  
Repurchased face amount 136,900    
Long-term debt 124,000    
Carrying amount of the equity component, net of issuance costs 13,700    
Loss on debt extinguishment and modification $ (2,200)