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Tax credit and other receivables/Other payables - Summary Of Income Tax Credit Recognized In Profit Loss (Detail) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Major components of tax expense (income) [abstract]      
Loss before Tax / Profit € (112,774) € (67,726) € (225,584)
Tax income (at 25%) 28,150 16,932 56,396
Unrecognized deferred tax assets on tax losses (28,150) (16,932) (56,396)
R&D tax credits (685) (5,468) (1,666)
Amortization of intangible assets identified     (10)
Tax expense/(credit) (18) 542 (131)
Income tax credit € (703) € (4,926) € (1,807)