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RELATED PARTY TRANSACTIONS - Expense and Payable (Details) - Entity Affiliated With Related Party - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Lexam L.P.      
RELATED PARTY TRANSACTIONS      
Expense $ 11 $ 76  
Related party outstanding accounts payable (receivable) 64   $ 72
REVlaw      
RELATED PARTY TRANSACTIONS      
Expense 35 $ 38  
Related party outstanding accounts payable (receivable) $ 194   $ 90