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Property, plant and equipment - Additional Information (Details) - EUR (€) € in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Right of use – Buildings | Gross book value of tangible assets |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Increase in right-of-use assets | € 228 | € 337
Transfer | 0 | 0
Right of use – Buildings | Gross book value of tangible assets | Wattignies |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Increase in right-of-use assets | 100 | 200
Right of use – Buildings | Gross book value of tangible assets | Waccano |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Increase in right-of-use assets | € 100 | 100
Right of use – Buildings | Bottom of Range |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Depreciation periods of property, plant and equipment | 5 years |
Right of use – Buildings | Top of Range |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Depreciation periods of property, plant and equipment | 10 years |
Technical equipment | Gross book value of tangible assets |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Increase in right-of-use assets | € 166 | 113
Transfer | € 0 | 300
Technical equipment | Bottom of Range |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Depreciation periods of property, plant and equipment | 3 years |
Technical equipment | Top of Range |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Depreciation periods of property, plant and equipment | 10 years |
Office and IT equipment | Gross book value of tangible assets |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Increase in right-of-use assets | € 227 | 41
Transfer | € (15) | 0
Office and IT equipment | Bottom of Range |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Depreciation periods of property, plant and equipment | 1 year |
Office and IT equipment | Top of Range |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Depreciation periods of property, plant and equipment | 10 years |
Fixtures, fittings and installations | Gross book value of tangible assets |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Increase in right-of-use assets | € 48 | 2
Transfer | € 22 | 0
Fixtures, fittings and installations | Bottom of Range |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Depreciation periods of property, plant and equipment | 5 years |
Fixtures, fittings and installations | Top of Range |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Depreciation periods of property, plant and equipment | 10 years |
Transfer | € 0 | 0
Gross book value of tangible assets |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Increase in right-of-use assets | 903 | 638
Transfer | € (25) | € 0

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- Definition The amount of additions to property, plant and equipment other than those acquired through business combinations. [Refer: Total for all business combinations [member]; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2024-01-01 -Paragraph 73 -Subparagraph e -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2024-en-r&anchor=para_73_e_i&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The increase (decrease) in property, plant and equipment resulting from transfers and changes that the entity does not separately disclose in the same statement or note. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 16 -IssueDate 2024-01-01 -Paragraph 73 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2024-en-r&anchor=para_73_e&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The useful life, measured as period of time, used for property, plant and equipment. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2024-01-01 -Paragraph 73 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2024-en-r&anchor=para_73_c&doctype=Standard -URIDate 2024-03-27 + Details
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