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Share-based payment plans - Additional information (Details) | 1 Months Ended | 12 Months Ended
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Mar. 31, 2025 Option € / shares | Nov. 30, 2023 Option € / shares | Oct. 31, 2023 Option € / shares | May 31, 2018 shares € / shares | Jul. 31, 2016 shares € / shares | Jul. 31, 2015 Option | Nov. 30, 2014 Option € / shares | Jul. 31, 2014 Option | Dec. 31, 2025 Option shares | Dec. 31, 2024 Option | Dec. 31, 2023 Option
Share-based payment plans |  |  |  |  |  |  |  |  |  |  |
Number of shares for each warrant |  |  |  |  |  |  |  |  | 1 |  |
IPO plan |  |  |  |  |  |  |  |  |  |  |
Share-based payment plans |  |  |  |  |  |  |  |  |  |  |
Number of shares for each warrant |  |  |  |  |  |  |  |  | 1 |  |
Term |  |  |  |  |  |  |  |  | P10Y |  |
Contractual term |  |  |  |  |  |  |  |  | 10 years |  |
vesting% first period |  |  |  |  |  |  |  |  | 25.00% |  |
vesting% second period |  |  |  |  |  |  |  |  | 25.00% |  |
vesting% fourth period |  |  |  |  |  |  |  |  | 25.00% |  |
Granted | Option |  |  |  |  |  | 18,180 | 36,151 | 979,898 |  |  |
vesting% third period |  |  |  |  |  |  |  |  | 25.00% |  |
Exercise price, share options granted | € / shares |  |  |  |  |  |  | € 8.81 |  |  |  |
Forfeited | Option |  |  |  |  |  |  |  |  |  | 47,524 | 4,257
2015 Warrant Plan |  |  |  |  |  |  |  |  |  |  |
Share-based payment plans |  |  |  |  |  |  |  |  |  |  |
Number of shares for each warrant |  |  |  |  |  |  |  |  | 1 |  |
Term |  |  |  |  |  |  |  |  | P10Y |  |
vesting% second period |  |  |  |  |  |  |  |  | 10.00% |  |
vesting% fourth period |  |  |  |  |  |  |  |  | 30.00% |  |
vesting% fifth period |  |  |  |  |  |  |  |  | 40.00% |  |
Granted |  |  |  | 2,000 | 350,000 |  |  |  |  |  |
vesting% third period |  |  |  |  |  |  |  |  | 20.00% |  |
Exercise price, share options granted | € / shares |  |  |  | € 10.08 | € 6.45 |  |  |  |  |  |
Maximum number of warrants |  |  |  |  |  |  |  |  | 1,400,000 |  |
Forfeited | Option |  |  |  |  |  |  |  |  | 12,600 | 2,000 |
Exercised | Option |  |  |  |  |  |  |  |  | 0 |  |
2023 Warrant Plan |  |  |  |  |  |  |  |  |  |  |
Share-based payment plans |  |  |  |  |  |  |  |  |  |  |
Number of shares for each warrant |  |  |  |  |  |  |  |  | 1 |  |
Term |  |  |  |  |  |  |  |  | P7Y |  |
vesting% second period |  |  |  |  |  |  |  |  | 10.00% |  |
vesting% fourth period |  |  |  |  |  |  |  |  | 30.00% |  |
vesting% fifth period |  |  |  |  |  |  |  |  | 40.00% |  |
Granted | Option | 25,000 | 25,000 | 325,000 |  |  |  |  |  | 25,000 |  | 350,000
vesting% third period |  |  |  |  |  |  |  |  | 20.00% |  |
Exercise price, share options granted | € / shares | € 7.59 | € 5.09 | € 4.87 |  |  |  |  |  |  |  |
Maximum number of warrants |  |  |  |  |  |  |  |  | 500,000 |  |
Forfeited | Option |  |  |  |  |  |  |  |  | 25,000 |  |

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- Definition The description of the maximum term of options granted for a type of share-based payment arrangement that existed at any time during the period. An entity with substantially similar types of share-based payment arrangements may aggregate this information. [Refer: Types of share-based payment arrangements [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2025-01-01 -Paragraph 45 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2025-en-r&anchor=para_45_a&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 31 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_31_a&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 31 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_31_a&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The number of share options exercised in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2025-01-01 -Paragraph 45 -Subparagraph b -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2025-en-r&anchor=para_45_b_iv&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 31 -Subparagraph b -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_31_b_iv&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 31 -Subparagraph b -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_31_b_iv&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The number of share options forfeited in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2025-01-01 -Paragraph 45 -Subparagraph b -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2025-en-r&anchor=para_45_b_iii&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 31 -Subparagraph b -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_31_b_iii&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 31 -Subparagraph b -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_31_b_iii&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The number of share options granted in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2025-01-01 -Paragraph 45 -Subparagraph b -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2025-en-r&anchor=para_45_b_ii&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 31 -Subparagraph b -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_31_b_ii&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 31 -Subparagraph b -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_31_b_ii&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares. + References No definition available. + Details
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