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RELATED PARTY TRANSACTIONS (Details) - USD ($) $ in Thousands | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Jun. 25, 2020 | Aug. 10, 2018
RELATED PARTY TRANSACTIONS |  |  |  |  |
Long-term debt from related party | $ 24,163 |  | $ 24,080 |  |
Robert McEwen | 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 |  |  |

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