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SUPPLEMENTAL DISCLOSURE WITH RESPECT TO CASH FLOWS (Tables)
 12 Months Ended
Dec. 31, 2020
Disclosure Of Cash Flow Statement Explanatory [Abstract]  
Disclosure of detailed information about cash and cash equivalents [Table Text Block]
    December 31, 2020     December 31, 2019  
Cash $ 50,745   $ 68,994  
Short-term deposits   1,957     187  
  $ 52,702   $ 69,181  
Disclosure of detailed information about changes in non-cash working capital [Table Text Block]
    Year ended     Year ended  
    December 31, 2020     December 31, 2019  
Accounts receivable $ (1,895 ) $ 1,139  
Prepaid expenses   (98 )   (277 )
Accounts payable and accrued liabilities   2,290     (4,403 )
Advances from joint venture partners   (310 )   460  
  $ (13 ) $ (3,081 )