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Trade Receivables - Summary of Trade Receivables (Detail) - EUR (€) € in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 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 | € 29,187 | € 40,967 | € 37,549
Gross trade receivables |  |  |
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 | 37,886 | 50,594 |
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 | (8,699) | (9,627) |
Domestic customers [member] | Gross trade receivables |  |  |
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 | 14,401 | 20,247 |
European Customers [member] | Gross trade receivables |  |  |
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 | 4,348 | 7,815 |
North American customers [member] | Gross trade receivables |  |  |
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 | 4,986 | 3,573 |
South American customers [member] | Gross trade receivables |  |  |
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 | 5,703 | 3,531 |
Chinese customers [member] | Gross trade receivables |  |  |
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 | 4,055 | 7,233 |
Other foreign customers [member] | Gross trade receivables |  |  |
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 | € 4,393 | € 8,195 |

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