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Total Operating Expenses - Summary of Total Operating Expenses (Detail) - EUR (€)
€ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Disclosure Of Operating Expenses [abstract]        
Manufacturing costs € 450 € 5,580 € 2,325 € 9,858
IP and license costs 585 492 876 844
Personnel related R&D 2,470 2,107 4,510 3,808
Other R&D costs 6,479 4,344 12,644 8,311
Total R&D costs 9,984 12,523 20,355 22,821
Management and administration costs 3,119 2,639 5,055 5,491
Litigation costs 59 552 123 849
Other operating expenses 3,684 2,745 7,624 5,134
Total other expenses 3,743 3,297 7,747 5,983
Total operating expenses € 16,846 € 18,459 € 33,157 € 34,295