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Deferred Revenue - Summary of Deferred Revenue (Detail) - EUR (€)
€ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Disclosure of deferred income [abstract]    
Deferred revenue - current portion € 17,208 € 16,934
Deferred revenue 89,666 97,675
Total deferred revenue € 106,874 € 114,609