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Segment reporting - Other financial information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Segment reporting      
Total assets $ 43,911 $ 64,421  
Intangible assets 490 680 $ 1,435
Property and equipment 909 899 $ 788
Right-of-use assets 616 818  
Amortization of intangible assets 202 704  
Depreciation of property and equipment 727 672  
Depreciation of right-of-use assets 217 228  
Canada      
Segment reporting      
Total assets 34,257 57,694  
Intangible assets 490 680  
Property and equipment 158 212  
Right-of-use assets 616 818  
Amortization of intangible assets 202 704  
Depreciation of property and equipment 57 59  
Depreciation of right-of-use assets 217 219  
USA      
Segment reporting      
Total assets 4,067 3,010  
Property and equipment 751 687  
Depreciation of property and equipment 670 613  
Germany      
Segment reporting      
Total assets 1,952 1,288  
China      
Segment reporting      
Total assets 82 56  
Depreciation of right-of-use assets   9  
Finland      
Segment reporting      
Total assets $ 3,553 $ 2,373