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Warrants and Share-based Payment - Schedule of Warrant Activity (Detail) - Warrants [member]
6 Months Ended
Jun. 30, 2021
€ / shares
Disclosure Of Warrant Activity [line items]  
Beginning balance 6,148,004
Granted during the period 158,590
Exercised during the period (150,604)
Forfeited during the period (90,167)
Ending balance 6,065,823
Vested at the balance sheet date 3,565,573
Beginning balance € 69.97
Granted during the period 120.15
Exercised during the period 33.51
Forfeited during the period 121.80
Ending balance 71.04
Vested at the balance sheet date € 46.23