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Segment reporting - Other financial information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Geographical areas      
Total assets $ 86,775 $ 104,601  
Goodwill and intangible assets 4,124 4,576  
Property and equipment (note 6) 788 859 $ 527
Right-of-use assets 1,116 1,424  
Amortization of intangible assets 1,029 881  
Depreciation of property and equipment 518 352  
Depreciation of right-of-use assets (note 8) 332 305  
Canada      
Geographical areas      
Total assets 81,529 98,890  
Goodwill and intangible assets 4,124 4,576  
Property and equipment (note 6) 490 859  
Right-of-use assets 1,106 1,325  
Amortization of intangible assets 1,029 881  
Depreciation of property and equipment 408 236  
Depreciation of right-of-use assets (note 8) 234 212  
USA      
Geographical areas      
Total assets 2,068 456  
Property and equipment (note 6) 298    
Depreciation of property and equipment 110    
Germany      
Geographical areas      
Total assets 1,445 1,682  
China      
Geographical areas      
Total assets 81    
Right-of-use assets 10    
Depreciation of right-of-use assets (note 8) 8    
Finland      
Geographical areas      
Total assets 1,652 3,573  
Right-of-use assets   99  
Depreciation of property and equipment   116  
Depreciation of right-of-use assets (note 8) $ 90 $ 93