v3.26.3
Basis of Preparation - Additional Information (Detail) - EUR (€)
€ in Thousands
6 Months Ended
Apr. 08, 2026
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Dec. 31, 2024
[2]
Basis of Preparation [Line Items]          
Profit (loss) [1]   € (47,938) € (34,476)    
Cash flows used in operating activities [2]   (2,844) 12,119    
Cash and cash equivalents   19,948 [3] € 27,304 [2] € 4,446 [2] € 20,036
Negative total equity balance   (59,562) [3]   (31,693)  
Total borrowings   191,251   164,666  
Trade payables   € 12,100      
Percentage of share capital pledged as collateral   100.00%      
Bridge loan € 5,650        
Loan and borrowings outstanding   € 208,815      
Capital increase € 10,600 82,519 [3]   € 66,260  
Maturing Through 2030 [Member] | Syndicate Term Loan [Member]          
Basis of Preparation [Line Items]          
Loan and borrowings outstanding   55,300      
Maturing in December 2030 [Member] | Bullet Instrument [Member]          
Basis of Preparation [Line Items]          
Loan and borrowings outstanding   68,000      
Maturing in December 2030 [Member] | Working Capital Line [Member]          
Basis of Preparation [Line Items]          
Loan and borrowings outstanding   34,400      
Maturing in December 2030 [Member] | New Working Capital Line [Member]          
Basis of Preparation [Line Items]          
Loan and borrowings outstanding   5,400      
Extended to December 31, 2030 [Member]          
Basis of Preparation [Line Items]          
Loan and borrowings outstanding   11,700      
Wall Box Chargers, S.L.U. [Member]          
Basis of Preparation [Line Items]          
Profit (loss)   (47,938)      
Retained earnings accumulated deficit   (179,513)      
Cash and cash equivalents   25,064      
Negative total equity balance   € (59,641)      
[1] Unaudited
[2] Unaudited
[3] Unaudited