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ACCRUED EXPENSES OTHER CURRENT LIABILITIES (Accrued Expenses) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
ACCRUED EXPENSES OTHER CURRENT LIABILITIES [Abstract]    
Accrued expenses $ 739 $ 906
Accrued compensation 417 685
Accrued interest 19 19
Accrued franchise, property and sales and use taxes 390 426
Accrued expenses $ 1,565 $ 2,036