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Warrants and Share-based Payment - Schedule of Warrant Activity (Detail) - Warrants [member]
6 Months Ended
Jun. 30, 2019
EUR (€)
Disclosure Of Warrant Activity [line items]  
Beginning balance 5,611,629
Granted during the period 226,500
Exercised during the period (618,089)
Forfeited during the period (20,863)
Expired during the period 0
Ending balance 5,199,177
Vested at the balance sheet date 2,482,458
Beginning balance € 29.03
Granted during the period 95.34
Exercised during the period 15.08
Forfeited during the period 44.38
Expired during the period 0.00
Ending balance 33.52
Vested at the balance sheet date € 20.46