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Shareholders' Equity - Summary of Reconciliation of Outstanding Share Options (Detail) | 6 Months Ended
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Jun. 30, 2019 EUR (€) shares
Disclosure of terms and conditions of share-based payment arrangement [abstract] |
Outstanding at January 1 | shares | 2,633,039
Forfeited during the six months | shares | (223,631)
Expired during the six months | shares | (126,589)
Exercised during the six months | shares | (9,980)
Granted during the six months | shares | 1,009,671
Outstanding at June 30 | shares | 3,282,510
Exercisable at June 30 | shares | 1,533,094
Outstanding at January 1 | € | € 14.62
Forfeited during the six months | € | 14.07
Expired during the six months | € | 15.95
Exercised during the six months | € | 11.02
Granted during the six months | € | 10.23
Outstanding at June 30 | € | 13.27
Exercisable at June 30 | € | € 13.34

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