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Operating Expenses - Summary of Research and Development (Detail) - EUR (€)
€ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Disclosure of Other Operating Expense [abstract]    
Personnel expenses € 20,419 € 22,051
Sub-contracting,collaborations and consultants 25,624 21,023
Depreciation and amortization 2,670 489
Small equipment and supplies 1,946 2,581
Conferences, travel expenses 792 1,234
Rental 333 965
Others 454 1,604
Total research and development expenses € 52,238 € 49,946