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Intangible assets - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about intangible assets [line items]    
Acquisition of intangible assets $ 17,279,000  
Additions to intangible assets 1,543,000 $ 246,000
Amortization expense 1,798,000 1,657,000
Arcola Energy Limited    
Disclosure of detailed information about intangible assets [line items]    
Acquisition of intangible assets 17,279,000  
ERP management reporting software system    
Disclosure of detailed information about intangible assets [line items]    
Additions to intangible assets 1,385,000 0
Manufacturing Execution System    
Disclosure of detailed information about intangible assets [line items]    
Additions to intangible assets $ 158,000 $ 246,000