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Intangible assets - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about intangible assets [line items]    
Additions to intangible assets $ 1,768 $ 154
Amortization expense 759 1,696
Impairment charges on intangible assets 658 2,266
Arcola Energy Limited    
Disclosure of detailed information about intangible assets [line items]    
Additions to intangible assets 1,768 154
Ballard Motive Solutions    
Disclosure of detailed information about intangible assets [line items]    
intangible assets fair value   0
Accumulated depreciation    
Disclosure of detailed information about intangible assets [line items]    
Additions to intangible assets 0 0
Amortization expense (759) (1,696)
Impairment charges on intangible assets $ 658 $ 2,266