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Operating Income - Summary of Operating Income (Detail) - EUR (€) € in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Analysis of income and expense [abstract] |  |  |
Revenues |  |  | € 202
Research tax credit | € 9,330 | € 7,228 | 5,685
Subsidies | 271 | 303 | 279
Other operating income | 2,308 | 1,554 |
Total income | € 11,909 | € 9,084 | € 6,166

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