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Financial instruments - Investments (Details) - USD ($) $ in Thousands | 12 Months Ended
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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

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