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Financial instruments - Investments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of financial assets [line items]    
Mark-to-market gain (loss) on financial assets $ (9,024) $ 0
Green Hydrogen    
Disclosure of financial assets [line items]    
Mark-to-market gain (loss) on financial assets 1,422 0
Forsee Power    
Disclosure of financial assets [line items]    
Mark-to-market gain (loss) on financial assets (10,474) 0
HyCap Fund    
Disclosure of financial assets [line items]    
Mark-to-market gain (loss) on financial assets 26 0
CleanH2 Fund    
Disclosure of financial assets [line items]    
Mark-to-market gain (loss) on financial assets $ 2 $ 0