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Tax on Profit/(Loss) for the Year and Deferred Tax - Additional Information (Detail) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Major components of tax expense (income) [abstract]      
Income taxes refund € 0.7 € 0.7 € 0.7
Tax losses carryforwards 1,985.0 1,437.0  
Additional tax deductions, determined by annual warrants exercises by employees € 5.2 € 4.8 € 16.3