Employee Benefits - Summary of Personnel Expenses Recognized for Share-based Payment Transactions (Detail) - EUR (€) € in Thousands	6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025
Disclosure of terms and conditions of share-based payment arrangement [line items]
Expense from share-based payment transactions with employees	€ 158	€ 539
ESPP [Member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Expense from share-based payment transactions with employees	0	22
Performance based earn out in shares and RSUs management [Member] \| AR Electronic Solutions, S.L. [Member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Expense from share-based payment transactions with employees	0	64
RSU Employees [Member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Expense from share-based payment transactions with employees	389	120
RSU Management [Member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Expense from share-based payment transactions with employees	186	367
Capitalization of sharebased payment transactions in intangible assets [Member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Expense from share-based payment transactions with employees	€ (45)	€ (34)