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Trade Receivables - Summary of Trade Receivables (Detail) - EUR (€)
€ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
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 € 40,967 € 37,549 € 40,138
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 50,594 48,324 49,682
Allowance 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 (9,627) (10,775) (9,544)
Domestic customers [member] | 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 20,247 22,399 22,332
North American customers [member] | 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 3,573 4,374 2,562
Chinese customers [member] | 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 7,233 618 374
European Customers [member] | 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 7,815 9,232 12,652
Other foreign customers [member] | 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 € 11,726 € 11,701 € 11,762