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Warrants and Share-based Payment - Schedule of Warrant Activity (Detail) - Warrants [member]
3 Months Ended
Mar. 31, 2019
EUR (€)
Disclosure Of Warrant Activity [line items]  
Beginning balance 5,611,629
Granted during the period 54,500
Exercised during the period 0
Forfeited during the period (15,352)
Expired during the period 0
Ending balance 5,650,777
Vested at the balance sheet date 2,786,556
Beginning balance € 29.03
Granted during the period 62.05
Exercised during the period 0.00
Forfeited during the period 40.07
Expired during the period 0.00
Ending balance 29.32
Vested at the balance sheet date € 17.70