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Segment reporting - Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Segment reporting          
Total assets $ 49,668   $ 49,668   $ 70,234
Intangible assets 175   175   261
Property and equipment 278   278   425
Right-of-use assets 303   303   396
Amortization of intangible assets     86 $ 101 229
Depreciation of property and equipment 102 $ 184 218 $ 383 707
Canada          
Segment reporting          
Total assets 38,180   38,180   58,743
Intangible assets 175   175   261
Property and equipment 69   69   93
Right-of-use assets 303   303   396
Amortization of intangible assets     86   229
Depreciation of property and equipment     23   66
USA          
Segment reporting          
Total assets 6,802   6,802   6,351
Property and equipment 209   209   332
Depreciation of property and equipment     195   641
Germany          
Segment reporting          
Total assets 1,502   1,502   1,661
China          
Segment reporting          
Total assets 60   60   92
Finland          
Segment reporting          
Total assets $ 3,124   $ 3,124   $ 3,387