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Total Operating Expenses - Summary of Total Operating Expenses (Detail) - EUR (€)
€ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Disclosure Of Operating Expenses [abstract]        
Manufacturing costs € 5,580 € 2,236 € 9,858 € 5,611
IP and license costs 492 603 844 968
Personnel related R&D 2,107 1,771 3,808 3,303
Other research and development costs 4,344 3,810 8,311 5,545
Total research and development costs 12,523 8,420 [1] 22,821 15,427 [1]
Management and administration costs 2,639 3,492 [1] 5,491 7,694 [1]
Litigation costs 552 104 849 394
Other operating expenses 2,745 2,173 5,134 3,726
Total other expenses 3,297 2,277 [1] 5,983 4,120 [1]
Total operating expenses € 18,459 € 14,189 [1] € 34,295 € 27,241 [1]
[1] See Note 3 for details regarding the restatement as a result of a change in accounting policy.