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Provisions and other liabilities - Narrative (Details) - USD ($)
 1 Months Ended 12 Months Ended
Jan. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Nov. 11, 2021
Disclosure of other provisions [line items]        
Provisions made during the year   $ 30,900,000 $ 3,295,000  
Upward adjustments / increase in provision   65,000    
Expenditures   4,030,000 2,634,000  
Downward adjustments / provision eliminated   1,112,000 1,486,000  
Effect of movements in exchange rates   (5,000) 48,000  
Onerous contracts provision   300,000    
Arcola Energy Limited        
Disclosure of other provisions [line items]        
Contingent cash consideration       $ 26,258,000
Arcola Energy Limited | Contingent consideration liability        
Disclosure of other provisions [line items]        
Payment of contingent consideration liability $ 4,800,000      
Arcola Energy Limited | Top of range        
Disclosure of other provisions [line items]        
Contingent consideration recognised as of acquisition date       $ 27,000,000
Cumulative Effect, Period of Adoption, Adjustment | Onerous Contracts-Cost of Fulfilling Contract        
Disclosure of other provisions [line items]        
Onerous contracts provision   1,200,000    
Warranty provision        
Disclosure of other provisions [line items]        
Provisions made during the year   4,102,000 3,189,000  
New additions to provision   2,711,000 3,098,000  
Upward adjustments / increase in provision   1,391,000 91,000  
Expenditures   3,894,000 2,569,000  
Downward adjustments / provision eliminated   1,112,000 1,486,000  
Effect of movements in exchange rates   (9,000) 11,000  
Decommissioning liabilities        
Disclosure of other provisions [line items]        
Provisions made during the year   109,000 40,000  
New additions to provision   44,000 40,000  
Upward adjustments / increase in provision     0  
Expenditures   0 0  
Downward adjustments / provision eliminated   0 0  
Effect of movements in exchange rates   $ 4,000 $ 36,000  
Estimated future cash flows discounted percentage   1.25% 0.39%  
Undiscounted amount of the estimated cash flows   $ 1,877,000 $ 1,764,000