Total revenues and other income - Summary of revenues (Details) - EUR (€) € in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure Of Total Revenues And Other Income [Abstract]
Recognition of non-refundable upfront payments and license fees	€ 71,971	€ 30,257	€ 26,419
Milestone payments	42,950	81,784	3,835
Reimbursement income	3,273	9,699	3,807
Other revenues	8,893	7,777	5,501
Total revenue	€ 127,087	€ 129,519	€ 39,563

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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