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Total Operating Expenses - Breakdown of Other Research and Development Costs (Detail) - EUR (€)
€ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Disclosure Of Operating Expenses [abstract]        
Discovery and pre-clinicalcosts € 1,078 € 1,698 € 1,763 € 2,076
Clinical costs 1,850 1,292 4,248 2,002
Other research and development costs 1,416 820 2,300 1,467
Total other research and development costs € 4,344 € 3,810 € 8,311 € 5,545