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Financial Instruments - Fair Values and Risk Management - Additional Information (Detail) - EUR (€) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2015 | Jan. 01, 2017 | Jun. 30, 2016 | Jul. 31, 2015
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Unused credit lines | € 24,010,000 | € 33,103,000 |  | € 34,451,000 |  |
Cash and cash equivalents | 62,131,000 | 55,035,000 |  | 64,981,000 |  |
Long-term borrowings | € 20,943,000 | € 25,717,000 |  | € 17,961,000 |  |
Fixed rate borrowings [member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Borrowings at fixed rate | 33.00% | 29.00% |  |  |  |
Top of range [member] | Non recourse factoring agreement [member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Sale of performing receivables |  |  | € 55,000,000 |  |  |
Revolving basis and with non-recourse clause [member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Maximum amount of performing receivables to sell | € 55,000,000 |  |  |  |  |
Credit risk [member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Percentage of insures the collections risk related to a significant portion of trade receivable | 80.00% |  |  |  |  |
Percentage of uncollected outstanding balances of trade receivable in case of insolvency | 85.00% |  |  |  |  |
Maximum amount of customer receivables to bank in exchange of short-term credit |  |  |  |  | € 55,000,000 | € 35,000,000
Percentage of insured receivables | 15.00% |  |  |  |  |
Credit risk [member] | Non recourse factoring agreement [member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Percentage of insured receivables | 0.00% |  |  |  |  |
Currency risk [member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Trade receivables | € 26,490,000 | € 16,991,000 |  |  |  |
Cash and cash equivalents | 23,822,000 | 26,711,000 |  |  |  |
Gain on derivative financial instruments | 143,000 | 339,000 |  |  |  |
Trade payables | 27,443,000 | 21,197,000 |  |  |  |
Losses on derivative financial instruments | 320,000 | 142,000 |  |  |  |
Currency risk [member] | Long-term borrowings [member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Long-term borrowings | 6,631,000 | 7,533,000 |  |  |  |
Currency risk [member] | Short-term borrowings [member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Long-term borrowings | € 7,184,000 | € 6,770,000 |  |  |  |

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