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SUPPLEMENTAL DISCLOSURE WITH RESPECT TO CASH FLOWS (Tables)
12 Months Ended
Dec. 31, 2019
Disclosure Of Cash Flow Statement Explanatory [Abstract]  
Disclosure of detailed information about cash and cash equivalents [Table Text Block]
    December 31, 2019     December 31, 2018  
Cash $ 68,994   $ 86,175  
Short-term deposits   187     196  
Total $ 69,181   $ 86,371  
Disclosure of detailed information about changes in non-cash working capital [Table Text Block]
    Year ended     Year ended  
    December 31, 2019     December 31, 2018  
Accounts receivable $ 1,139   $ 1,280  
Prepaid expenses   (277 )   13  
Accounts payable and accrued liabilities   (4,403 )   4,981  
Advances from joint venture partners   460     (193 )
  $ (3,081 ) $ 6,081