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Commitments and contingencies (Details) € in Thousands, £ in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2021 USD ($) | Dec. 31, 2021 EUR (€) | Dec. 31, 2021 GBP (£) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2021 EUR (€) | Dec. 31, 2021 GBP (£) | Dec. 31, 2021 CAD ($)
Disclosure of other provisions [line items] |  |  |  |  |  |  |  |
Capital commitments | $ 22,800,000 |  |  | $ 22,800,000 |  |  |  |
Royalty related to UTC, revenue obligations |  |  |  |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |  |  |  |
Expiration period (years) |  |  |  | 15 years |  |  |  |
Royalty payments |  |  |  | $ 0 | $ 0 |  |  |
Royalty obligation, percentage |  |  |  | 2.00% |  |  |  |
Maximum royalty expense | 4,613,000 |  |  | $ 4,613,000 |  |  |  | $ 5,351
Royalty expense |  |  |  | $ 0 |  |  |  |
Royalty of other revenue obligations |  |  |  |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |  |  |  |
Royalty obligation, percentage |  |  |  | 2.00% |  |  |  |
Maximum royalty expense | 1,896,000 |  |  | $ 1,896,000 |  |  |  | $ 2,200
Royalty expense |  |  |  | $ 0 |  |  |  |
HyCap Fund | Initial Contribution |  |  |  |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |  |  |  |
Capital commitments | £ |  |  |  |  |  |  | £ 25,000 |
Capital contributions | 7,610,000 |  | £ 5,665 |  |  |  |  |
CleanH2 Fund | Initial Contribution |  |  |  |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |  |  |  |
Capital commitments | € |  |  |  |  |  | € 30,000 |  |
Capital contributions | $ 337,000 | € 300 | £ 300 |  |  |  |  |

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