Annual report pursuant to Section 13 and 15(d)

LONG-TERM DEBT AND COMMON STOCK WARRANT LIABILITY - Scheduled Maturities of Long-term Debt (Details)

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LONG-TERM DEBT AND COMMON STOCK WARRANT LIABILITY - Scheduled Maturities of Long-term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Outstanding Principal $ 99,000 $ 96,063
Senior Secured Notes    
Debt Instrument [Line Items]    
2019 1,000  
2020 1,000  
2021 1,000  
2022 1,000  
2023 1,000  
Thereafter 94,000  
Outstanding Principal $ 99,000