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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Disclosure Of Operating Expenses [abstract]        
Discovery and preclinical costs € 2,055 € 1,078 € 4,175 € 1,763
Clinical costs 3,156 1,850 6,041 4,248
Other R&D costs 1,268 1,416 2,428 2,300
Total other R&D costs € 6,479 € 4,344 € 12,644 € 8,311