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DEBT FINANCING - Maturities of Long-term Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Debt Disclosure [Abstract]    
2021 $ 2,167  
2022 13,000  
2023 10,833  
Principal amount of long-term debt $ 26,000 $ 26,000