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Shareholders' Equity - Additional Information - Share Based Payment Arrangements (Detail)
 6 Months Ended
Jun. 30, 2019
EUR (€)
shares
Jun. 30, 2018
EUR (€)
Jan. 01, 2019
shares
Dec. 31, 2018
EUR (€)
shares
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Share based payment expense € 3,100,000 € 4,600,000    
Option granted | shares 1,009,671      
Weighted average exercise price € 13.27     € 14.62
Weighted-average remaining contractual life 7 years 3 months 18 days      
Weighted-average share price € 11.02      
Number of share options outstanding in share-based payment arrangement | shares 3,282,510     2,633,039
Top of range [member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Weighted average exercise price € 1.93      
Bottom of range [member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Weighted average exercise price € 27.47      
2016 Plan [member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Description of options vested Options granted under the 2016 Plan are exercisable once vested.      
Vesting period 4 years      
Percentage of initial vesting period 25.00%      
Percentage of remaining vesting options 75.00%      
Period of remaining option vesting period 36 monthly installments      
Percentage of vesting period 100.00%      
Description of option lapse Options will lapse on the tenth anniversary of the date of grant.      
Vesting period of Restricted Stock Units vested 4 years      
Number of common share entitled to receive | shares 1      
Option granted | shares 1,009,671      
Option grant fair value € 10,300,000      
Increase in authorized share | shares     1,469,785 934,359
Non-Executive Compensation Program [member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Percentage of initial vesting period 33.00%      
Percentage of remaining vesting options 67.00%      
Period of remaining option vesting period 24 substantially equal monthly installments      
Vesting period Three-year period      
Period of option will be vested and exercised 12 substantially equal monthly installments      
Description of grant award Following the vesting commencement date, such that the subsequent award shall be fully vested on the first anniversary of the date of grant.