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DEBT - Outstanding principal balances (Details) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Less: Short term portion $ (438,000) $ (219,000)
Long term portion of debt 864,000 $ 1,083,000
PPP Loan    
Debt Instrument [Line Items]    
Term Loan 1,302,000  
Less: Short term portion (438,000)  
Long term portion of debt $ 864,000