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Revenue - Schedule of Revenue Recognized in Statements of Profit or Loss (Parenthetical) (Detail) - EUR (€)
€ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Revenue [abstract]        
Deferred revenue from associate € 579 € 1,013 € 1,155 € 2,215