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Intangible assets (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Intangible Assets [Line Items]    
Beginning balance $ 39,593 $ 31,155
Additions 4,796 8,438
Ending balance 44,389 39,593
Accumulated Depreciation [Member]    
Disclosure Of Intangible Assets [Line Items]    
Beginning balance 18,336 12,497
Amortization 7,141 5,839
Ending balance 25,477 18,336
Net Book Value [Member]    
Disclosure Of Intangible Assets [Line Items]    
Beginning balance 21,257  
Ending balance 18,912 21,257
Internally Generated Completed [Member]    
Disclosure Of Intangible Assets [Line Items]    
Beginning balance 34,849 26,901
Transfers 4,655 7,948
Ending balance 39,504 34,849
Internally Generated Completed [Member] | Accumulated Depreciation [Member]    
Disclosure Of Intangible Assets [Line Items]    
Beginning balance 15,138 9,374
Amortization 7,093 5,764
Ending balance 22,231 15,138
Internally Generated Completed [Member] | Net Book Value [Member]    
Disclosure Of Intangible Assets [Line Items]    
Beginning balance 19,711  
Ending balance 17,273 19,711
Internally Generated In Process [Member]    
Disclosure Of Intangible Assets [Line Items]    
Beginning balance 1,388 898
Additions 4,796 8,438
Transfers (4,655) (7,948)
Ending balance 1,529 1,388
Internally Generated In Process [Member] | Net Book Value [Member]    
Disclosure Of Intangible Assets [Line Items]    
Beginning balance 1,388  
Ending balance 1,529 1,388
Acquired Software Licences [Member]    
Disclosure Of Intangible Assets [Line Items]    
Beginning balance 3,356 3,356
Ending balance 3,356 3,356
Acquired Software Licences [Member] | Accumulated Depreciation [Member]    
Disclosure Of Intangible Assets [Line Items]    
Beginning balance 3,198 3,123
Amortization 48 75
Ending balance 3,246 3,198
Acquired Software Licences [Member] | Net Book Value [Member]    
Disclosure Of Intangible Assets [Line Items]    
Beginning balance 158  
Ending balance $ 110 $ 158