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Trade Receivables - Summary of Trade Receivables (Detail) - EUR (€)
€ in Thousands
Dec. 31, 2020
Dec. 31, 2019
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 € 33,934 € 29,187
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 41,815 37,886
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 10,259 14,401
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 11,128 4,348
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 5,447 4,986
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 3,482 5,703
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 6,873 4,055
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 4,626 4,393
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 € (7,881) € (8,699)