Quarterly report pursuant to Section 13 or 15(d)

LONG-TERM DEBT - Long-Term Debt (Details)

v3.21.2
LONG-TERM DEBT - Long-Term Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Unamortized discounts and debt issuance costs $ (8,731) $ (5,173)
Long-term debt, net 306,875 107,258
Current portion of long-term debt (1,546) (426)
Long-term debt, net of current portion, unamortized discount and issuance costs 305,329 106,832
Senior Secured Notes Due 2028 | Senior Secured Notes    
Debt Instrument [Line Items]    
Outstanding principal 310,000  
Estimated fair value 333,300  
Senior Secured Notes Due 2024 | Unsecured Debt    
Debt Instrument [Line Items]    
Outstanding principal   106,825
Unsecured Loans CARES Act [Member]    
Debt Instrument [Line Items]    
Outstanding principal $ 5,606 $ 5,606