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ACCRUED EXPENSES OTHER CURRENT LIABILITIES (Accrued Expenses) (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
ACCRUED EXPENSES OTHER CURRENT LIABILITIES [Abstract]    
Accrued expenses $ 1,192 $ 1,332
Accrued compensation 550 685
Accrued interest 19 19
Accrued expenses $ 1,761 $ 2,036