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RELATED PARTY TRANSACTIONS (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Jun. 25, 2020
Aug. 10, 2018
RELATED PARTY TRANSACTIONS              
Long-term debt from related party $ 22,340   $ 22,340   $ 24,080    
Chairman and Chief Executive Officer | Term Loan              
RELATED PARTY TRANSACTIONS              
Face amount           $ 50,000 $ 50,000
Long-term debt from related party           $ 25,000  
Affiliate of Robert McEwen              
RELATED PARTY TRANSACTIONS              
Debt interest expense $ 600 $ 600 $ 1,800 $ 1,800