v3.26.3
Government Grants - Summary of Details of Government Grants (Detail) - EUR (€)
€ in Thousands
 6 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Disclosure Of Details of Government grants [Line Items]    
Non-current liability € 4,544 [1] € 5,646
Current liability € 365 [1] 453
Movilidad 2030 [Member]    
Disclosure Of Details of Government grants [Line Items]    
Government Entity Centro para el Desarrollo Tecnológico Industrial. E.P.E. (CDTI)  
Non-current liability € 325 394
Current liability € 26 31
Zeus Ptas [Member]    
Disclosure Of Details of Government grants [Line Items]    
Government Entity Centro para el Desarrollo Tecnológico Industrial. E.P.E. (CDTI)  
Non-current liability € 204 239
Current liability € 16 19
Alt impacte [Member]    
Disclosure Of Details of Government grants [Line Items]    
Government Entity Agencia para la Competitividad de la Empresa de la Generalitat de Catalunya (ACCIÓ)  
Non-current liability € 243 289
Current liability € 19 23
Minichargers [Member]    
Disclosure Of Details of Government grants [Line Items]    
Government Entity Centro para el Desarrollo Tecnológico Industrial. E.P.E. (CDTI)  
Non-current liability € 26 34
Current liability € 2 3
Accio creaci lloc treballs [Member]    
Disclosure Of Details of Government grants [Line Items]    
Government Entity Agencia para la Competitividad de la Empresa de la Generalitat de Catalunya (ACCIÓ)  
Non-current liability € 92 96
Current liability € 7 8
Hermes Estudios [Member]    
Disclosure Of Details of Government grants [Line Items]    
Government Entity Ministerio de Industria, Comercio y Turismo  
Non-current liability € 70 242
Current liability € 6 19
Hermes Desarrollo [Member]    
Disclosure Of Details of Government grants [Line Items]    
Government Entity Ministerio de Industria, Comercio y Turismo  
Non-current liability € 411 696
Current liability € 33 57
Hermes Formacion [Member]    
Disclosure Of Details of Government grants [Line Items]    
Government Entity Ministerio de Industria, Comercio y Turismo  
Non-current liability   40
Current liability   3
Top Gun [Member]    
Disclosure Of Details of Government grants [Line Items]    
Government Entity Centro para el Desarrollo Tecnológico Industrial, E.P.E. (CDTI)  
Non-current liability € 18 21
Current liability € 1 2
Torres Quevedo [Member]    
Disclosure Of Details of Government grants [Line Items]    
Government Entity Agencia Estatal de Investigación  
Non-current liability € 52 60
Current liability € 4 5
ILIOS PERTE VEC 2 [Member]    
Disclosure Of Details of Government grants [Line Items]    
Government Entity Ministerio de Industria, Comercio y Turismo  
Non-current liability € 2,410 2,599
Current liability € 193 208
GRID FORMING LOAD [Member]    
Disclosure Of Details of Government grants [Line Items]    
Government Entity European Climate, Infrastructure and Environment Executive Agency (CINEA)  
Non-current liability € 254 296
Current liability € 20 24
REDWDS USA [Member]    
Disclosure Of Details of Government grants [Line Items]    
Government Entity California Energy Commission  
Non-current liability € 280 474
Current liability € 22 38
Camara De Comercio [Member]    
Disclosure Of Details of Government grants [Line Items]    
Government Entity Cámara de Comercio  
Non-current liability € 90 94
Current liability € 7 8
Installer Program [Member]    
Disclosure Of Details of Government grants [Line Items]    
Government Entity Agencia para la Competitividad de la Empresa de la Generalitat de Catalunya (ACCIÓ)  
Non-current liability € 14 15
Current liability € 1  
Reborn [Member]    
Disclosure Of Details of Government grants [Line Items]    
Government Entity Agencia de residuos de Cataluña  
Non-current liability € 55 57
Current liability € 8 € 5
[1] Unaudited