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Revenue - Additional Information (Details) € in Thousands | 12 Months Ended
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Dec. 31, 2023 EUR (€) item | Dec. 31, 2022 EUR (€) | Dec. 31, 2021 EUR (€)
Revenue |  |  |
Revenue | € 108,622 | € 106,424 | € 60,938
Revenue not from contracts with customers | € 79,000 | 91,000 | 43,000
Number of windfarm installation vessels | item | 4 |  |
Contract backlog (excluding bunker) as of the reported date | € 1,557,000 | 780,000 | 409,000
Firm contract |  |  |
Revenue |  |  |
Contract backlog (excluding bunker) as of the reported date | 1,379,000 | 653,000 |
Contract backlog (excluding bunker) as of the reported date |  | 127,000 |
Options contract |  |  |
Revenue |  |  |
Contract backlog (excluding bunker) as of the reported date | 178,000 |  | 351,000
Contract backlog (excluding bunker) as of the reported date |  |  | 58,000
Customer 1 |  |  |
Revenue |  |  |
Revenue | 44,500 | 52,400 | 24,600
Customer 2 |  |  |
Revenue |  |  |
Revenue | 28,500 | € 53,200 | € 29,100
Customer 3 |  |  |
Revenue |  |  |
Revenue | € 22,700 |  |

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- Definition Amount of orders, production or production backlog arising from contracts at the report date. + References No definition available. + Details
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- Definition Amount of orders, production or production backlog arising from contracts at the release date. + References No definition available. + Details
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- Definition Represents the number of offshore jack-up windfarm installation vessels held for operations. + References No definition available. + Details
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- Definition Amount of revenue that is not accounted for under IFRS 15. + References No definition available. + Details
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- Definition The amount of revenue from contracts with customers. A customer is a party that has contracted with an entity to obtain goods or services that are an output of the entity’s ordinary activities in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2023-01-01 -Paragraph 114 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2023-en-r&anchor=para_114&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2023-01-01 -Paragraph 113 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2023-en-r&anchor=para_113_a&doctype=Standard -URIDate 2023-03-23 + Details
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