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Use of Estimates, Judgments and Assumptions - Additional Information (Detail) - EUR (€)
€ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Disclosure of changes in accounting estimates [line items]        
Income tax expenses € 87 € 107 [1] € 139 € 118 [1]
United States [member]        
Disclosure of changes in accounting estimates [line items]        
Income tax expenses € 100 € 100 € 100 € 100
[1] See Note 3 for details regarding the restatement as a result of a change in accounting policy.