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Basis of Accounting - Additional Information (Detail) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Oct. 01, 2021
Dec. 31, 2020
Basis of Preparation [Line Items]          
Profit (loss) € (112,071) € (62,800) € (223,777)    
Cash flows used in operations (64,100) (136,292) (69,631)    
Cash and cash equivalents 101,158 83,308 € 113,865   € 22,338
Positive total equity balance 149,789 169,150   € 216,028  
Capitalized development costs 66,408 € 49,537      
Wall Box Chargers, S.L.U. [Member]          
Basis of Preparation [Line Items]          
Profit (loss) (112,071)        
Retained earnings accumulated deficit (420,195)        
Cash and cash equivalents 101,158        
Positive total equity balance € 149,811