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Income tax - Disclosure of deferred tax assets and liabilities by nature (Details) - EUR (€)
€ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets € 155,715 € 116,006 € 77,558
Deferred tax liabilities 1,584 444 1,427
Deferred tax assets, net 154,131 115,562 76,130
Unrecognized deferred tax assets (154,131) (115,562) (76,130)
Total deferred taxes, net recognized in the statement of financial position 0 0 0
Retirement benefit obligation      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 189 157 152
Subsidies      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax liabilities 12 24 50
Leases      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 591 135 0
Deferred tax liabilities 485 124 0
Other financial liabilities      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 1,678 351 198
Deferred tax liabilities 1,075 285 1,377
Tax losses carryforward      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 152,372 114,946 77,207
Other items      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 886 417 0
Deferred tax liabilities € 12 € 10 € 0