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Financial risks (Tables)
 12 Months Ended
Dec. 31, 2021
Financial Risk Management [Abstract]  
Disclosure of detailed information about foreign currency risk [Table Text Block]
          December 31,  
    2021     2020  
    $     $  
             
Cash and cash equivalents   23,755     90,638  
Amounts receivable   2,600     1,709  
Other assets   1,319     1,327  
Accounts payable and accrued liabilities   (117 )   (110 )
Revolving credit facility   (50,000 )   (50,000 )
             
Net exposure, in U.S. dollars   (22,443 )   43,564  
             
Equivalent in Canadian dollars   (28,453 )   55,466  
Disclosure of detailed information about liquidity risk [Table Text Block]
                          As at December 31, 2021  
  Total                       Estimated annual payments  
  amount                    
  payable Maturity   2022     2023     2024     2025     2026-2029  
  $     $     $     $     $     $  
                                   
Conv. debentures 312,000 December 31, 2022   312,000     -     -     -     -  
Revolving credit facility(i) 128,788 July 30, 2025   4,297     4,297     4,297     115,897     -  
Equipment financings 3,969 October 10, 2025   1,584     1,664     393     328     -  
Lease liabilities 20,213 December 31, 2029   9,388     2,919     1,478     1,291     5,137  
  464,970     327,269     8,880     6,168     117,516     5,137  

(i)  The interest payable is based on the actual interest rates and foreign exchange rates as at December 31, 2021.