Annual report pursuant to Section 13 and 15(d)

BORROWINGS - Schedule of Borrowings (Details)

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BORROWINGS - Schedule of Borrowings (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]      
Principal repayment obligation $ 56,500 $ 119,217  
Unamortized debt issuance costs and discounts (2,813) (8,123)  
Carrying value 53,687 111,094  
Paid-in-kind interest 508 3,317 $ 0
Senior Notes due 2028      
Debt Instrument [Line Items]      
Principal repayment obligation 56,500    
Unamortized debt issuance costs and discounts (2,813)    
Carrying value 53,687    
2020 Unsecured Note      
Debt Instrument [Line Items]      
Principal repayment obligation 0 16,000  
Unamortized debt issuance costs and discounts 0 (2,376)  
Carrying value 0 13,624  
2019 Term Loan      
Debt Instrument [Line Items]      
Principal repayment obligation 0 43,217  
Unamortized debt issuance costs and discounts 0 (4,942)  
Carrying value 0 38,275  
Paid-in-kind interest   3,300  
2018 Term Loan      
Debt Instrument [Line Items]      
Principal repayment obligation 0 60,000  
Unamortized debt issuance costs and discounts 0 (805)  
Carrying value $ 0 $ 59,195