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Intangible assets - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about intangible assets [line items]    
Impairment charges on intangible assets $ 2,266 $ 13,017
Additions to intangible assets 154 550
Amortization expense 1,696 3,107
Arcola Energy Limited    
Disclosure of detailed information about intangible assets [line items]    
Additions to intangible assets 154 550
Amortization expense   13,017
Accumulated amortization    
Disclosure of detailed information about intangible assets [line items]    
Impairment charges on intangible assets 2,266 13,017
Additions to intangible assets 0 0
Amortization expense $ (1,696) $ (3,107)