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FINANCING ARRANGEMENTS - Non-amortizing term loan (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
May 31, 2018
Debt Instrument      
Long-term debt, net of issuance costs $ 52,067,000 $ 30,321,000  
Medium-term Notes | Non-amortizing Term Loan      
Debt Instrument      
Loaned amount     $ 11,000,000
Interest rate 9.50%    
Debt instrument, term 60 months    
Long-term debt, net of issuance costs   $ 11,000,000