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Supplemental Cash Flow Information (Tables)
 12 Months Ended
Dec. 31, 2020
Statement of cash flows [abstract]  
Disclosure of supplemental cash flow information
    Years ended December 31  
    2020     2019  
Amounts receivable   $ (582 )   $ 3  
Prepaid expenses and deposits     (242 )     100  
Accounts payable and accrued liabilities     (72 )      182  
Changes in non-cash working capital   $ (896 )   $ 285