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Trade Receivables - Summary of Trade Receivables by Geographic Region (Detail) - EUR (€)
€ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Total trade receivables, net € 32,819 € 33,304 € 32,819
Gross carrying amount [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Total trade receivables, net 36,480 37,567 € 36,480
Gross carrying amount [member] | Italian Customers [Member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Total trade receivables, net 6,633 8,349  
Gross carrying amount [member] | Other European Customers      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Total trade receivables, net 8,402 6,553  
Gross carrying amount [member] | North American customers [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Total trade receivables, net 9,277 9,182  
Gross carrying amount [member] | Chinese customers [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Total trade receivables, net 4,435 4,347  
Gross carrying amount [member] | South American customers [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Total trade receivables, net 4,300 5,447  
Gross carrying amount [member] | Other foreign customers [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Total trade receivables, net 3,433 3,689  
Provision for doubtful accounts [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Total trade receivables, net € (3,661) € (4,263)