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Operating Expenses - Summary of Sales and Marketing Expenses (Detail) - EUR (€)
€ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Disclosure of sales and marketing expense [abstract]    
Personnel expenses € 5,961 € 4,147
Fees 1,541 3,869
Depreciation and amortization 391 3
Marketing, tradeshows and travel expenses 342 1,692
Others 92 17
Total sales and marketing expenses € 8,327 € 9,728