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RELATED PARTY TRANSACTIONS - Expense and Payable (Details) - Entity Affiliated With Related Party [Member] - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Lexam LP [Member] |  |  |  |  |
RELATED PARTY TRANSACTIONS |  |  |  |  |
Expense | $ 4 |  | $ 78 | $ 87 |
Related party outstanding accounts payable (receivable) | 4 |  | 4 |  | $ 72
REVlaw |  |  |  |  |
RELATED PARTY TRANSACTIONS |  |  |  |  |
Expense | 69 | $ 34 | 210 | $ 122 |
Related party outstanding accounts payable (receivable) | $ 85 |  | $ 85 |  | $ 90

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