Annual report pursuant to Section 13 and 15(d)

LONG-TERM DEBT, COMMON STOCK WARRANT LIABILITY, AND SUBSEQUENT EVENT - Long-Term Debt (Details)

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LONG-TERM DEBT, COMMON STOCK WARRANT LIABILITY, AND SUBSEQUENT EVENT - Long-Term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Unamortized discounts and debt issuance costs $ (5,173) $ (3,902)
Long-term debt, net 107,258 104,023
Current portion of long-term debt (426) (1,100)
Long-term debt, net of current portion, unamortized discount and issuance costs 106,832 102,923
Senior Secured Notes    
Debt Instrument [Line Items]    
Outstanding principal 106,825  
Unsecured Debt    
Debt Instrument [Line Items]    
Outstanding principal 5,606  
Senior Secured Notes Due 2024 | Senior Secured Notes    
Debt Instrument [Line Items]    
Outstanding principal 106,825 107,925
Unsecured Loan (CARES Act) | Unsecured Debt    
Debt Instrument [Line Items]    
Outstanding principal $ 5,606 $ 0