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Cash and cash equivalents - Additional Information (Details) - EUR (€) € in Thousands | Dec. 31, 2025 | Dec. 31, 2024
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Cash held in China |  |
Disclosure Of Cash And Cash Equivalents And Restricted Cash And Cash Equivalents [Line Items] |  |
Restricted cash and cash equivalents | € 27,668 | € 22,105

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- Definition The amount of cash and cash equivalents whose use or withdrawal is restricted. [Refer: Cash and cash equivalents] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_55&doctype=Standard -URIDate 2025-03-27 + Details
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Balance Type: | debit
Period Type: | instant

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- Definition Disclosure of cash and cash equivalents and restricted cash and cash equivalents line items. + References No definition available. + Details
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Data Type: | xbrli:stringItemType
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- Details
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Namespace Prefix: |
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Balance Type: |
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