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Tax on Profit/(Loss) for the Year and Deferred Tax - Additional Information (Detail) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Major components of tax expense (income) [abstract] |  |  |
Income taxes refund | € 0.7 | € 0.7 | € 0.7
Tax losses carryforwards | 1,946.2 | 2,371.3 |
Decrease in tax losse carry forwards |  | 456.8 |
Additional tax deductions, determined by annual warrants exercises by employees | 21.7 | 10.6 | 5.2
Additional future tax deduction | 11.0 | 0.3 | 0.3
Additional tax deductions related to tax credits | 13.8 | € 8.4 | € 8.4
Revenue threshold limit | € 750.0 |  |

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- Definition Additional tax deductions related to tax credits. + References No definition available. + Details
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