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Financial Revenue and Expenses - Summary of Financial Income and Expenses (Detail) - EUR (€) € in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure Of Detail Information About Financial Income And Expenses [line items] |  |  |
Financial revenues | € 616 | € 1,516 | € 1,018
Financial expenses | (3,325) | (16) | (146)
Total | € (2,709) | 1,500 | € 871
Scenario, Previously Reported [Member] |  |  |
Disclosure Of Detail Information About Financial Income And Expenses [line items] |  |  |
Financial revenues |  | 1,646 |
Financial expenses |  | € (145) |

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