Revenue - Schedule of Revenue Recognized in Statements of Profit or Loss (Detail) - EUR (€) € in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Disclosure of operating segments [line items]
Revenue from the rendering of services (recognized over time)	€ 5,414	€ 28
Total revenue	5,414	28
Revenue from external customers (geographical)
Total revenue	5,414	28
Total revenue	5,414	28
North America [member]
Disclosure of operating segments [line items]
Total revenue	5,414	28
Revenue from external customers (geographical)
Total revenue	5,414	28
Total revenue	€ 5,414	€ 28

The income arising in the course of an entity's ordinary activities. Income is increases in economic benefits during the accounting period in the form of inflows or enhancements of assets or decreases of liabilities that result in an increase in equity, other than those relating to contributions from equity participants.

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+ Details