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Operating Expenses - Summary of Research and Development (Detail) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of Other Operating Expense [Abstract]      
Personnel expenses € 37,112 € 32,777 € 13,268
Sub-contracting,collaboration, and consultants 54,397 34,413 15,325
Research supplies 1,464 1,234 911
Rental 2,018 1,903 1,094
Conferences, travel expenses 2,807 2,387 1,233
Depreciation and amortization 2,424 1,141 1,000
Small equipments and other supplies 2,646 2,675 795
Others 2,364 2,298 608
Total research and development expenses € 105,232 € 78,828 € 34,234