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Asset retirement obligations - Additional information (Details) € in Thousands, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 EUR (€) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Disclosure of Asset Retirement Obligations [line items] |  |  |
Restricted cash | $ |  | $ 2,674 | $ 2,097
Environmental Guarantee Deposit |  |  |
Disclosure of Asset Retirement Obligations [line items] |  |  |
Restricted cash | $ |  | $ 2,614 | $ 2,060
Greece | 50.0 million Letter of Credit |  |  |
Disclosure of Asset Retirement Obligations [line items] |  |  |
Letter of guarantee | € | € 50,000 |  |
Letter of guarantee expiration date | Jul. 26, 2026 |  |
Letter of guarantee annual fee | 1.87% |  |
Greece | 7.5 million Letter of Guarantee |  |  |
Disclosure of Asset Retirement Obligations [line items] |  |  |
Letter of guarantee | € | € 7,500 |  |
Letter of guarantee expiration date | Jul. 26, 2026 |  |
Letter of guarantee annual fee | 1.87% |  |

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