Segment information - Revenues by destination (Details) € in Thousands	12 Months Ended
Dec. 31, 2017 EUR (€) company	Dec. 31, 2016 EUR (€) company	Dec. 31, 2015 EUR (€) company
Disclosure of geographical areas [line items]
Amount of clients representing the largest pharmaceutical companies in the world \| company	7	7	7
Revenue	€ 127,087	€ 129,519	€ 39,563
United States
Disclosure of geographical areas [line items]
Revenue	82,050	88,628	17,077
Europe
Disclosure of geographical areas [line items]
Revenue	€ 45,037	40,884	22,446
Asia Pacific
Disclosure of geographical areas [line items]
Revenue		€ 6	€ 40
Top Ten Customers [Member]
Disclosure of geographical areas [line items]
Percentage of entity's revenue	97.00%	98.00%	97.00%

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