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Trade Receivables - Summary of Trade Receivables (Detail) - EUR (€) € in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2017
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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

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