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ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES (Accrued Expenses) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES [Abstract]    
Accrued expenses $ 1,332 $ 1,268
Accrued compensation 685 247
Accrued interest 19 124
Accrued expenses $ 2,036 $ 1,639