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Recently Issued International Financial Reporting Standards - Condensed Consolidated Statements of Financial Positions (Detail) - EUR (€)
€ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Condensed Balance Sheet Statements, Captions [Line Items]    
Accumulated loss € (167,226) € (158,775) [1]
Deferred revenue, non-current 105,718 112,551 [1]
Deferred revenue € 16,972 15,935 [1]
Previously stated [member]    
Condensed Balance Sheet Statements, Captions [Line Items]    
Accumulated loss   (167,480)
Deferred revenue, non-current   130,195
Deferred revenue   6,996
Increase (decrease) due to application of IFRS 15 [member]    
Condensed Balance Sheet Statements, Captions [Line Items]    
Accumulated loss   8,705
Deferred revenue, non-current   (17,644)
Deferred revenue   € 8,939
[1] See Note 3 for details regarding the restatement as a result of a change in accounting policy.