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Other Current Assets - Summary of Other Current Assets (Detail) - EUR (€)
€ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of other assets [abstract]      
Research tax credit € 16,802 € 10,829 € 9,200
Other tax claims 3,517 4,292  
Other receivables 2,391 1,745  
Prepaid expenses 5,474 4,265  
Total € 28,183 € 21,131