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Revenue - Additional Information (Detail) - EUR (€) € in Thousands		3 Months Ended			6 Months Ended			12 Months Ended
	Jun. 12, 2017	Jun. 30, 2018	Jun. 30, 2017		Jun. 30, 2018	Jun. 30, 2017		Dec. 31, 2017
Revenue [line items]
Revenue		€ 6,543	€ 6,237	[1]	€ 16,464	€ 10,121	[1]
Grant income		100	800		€ 200	800
Reimbursement of grant	€ 700
Payment terms related to receivables					30 days
Revenue recognized included in deferred revenue					€ 7,900
Revenue recognized not included in deferred revenue					1,300
Collaboration income [member]
Revenue [line items]
Revenue		2,179	1,471		7,195	2,391
Incyte collaboration agreement [member]
Revenue [line items]
Up-front payment amortization		4,000	4,000		7,900	6,900
Cost reimbursements		2,000	€ 1,500		4,300
ONO Research and License Agreement [member]
Revenue [line items]
Up-front payment amortization		200			1,100
Cost reimbursements		100			200	€ 2,400
Milestone revenue					2,500
Simcere collaboration and license agreement [member]
Revenue [line items]
Up-front payment amortization		100			100
Milestone revenue		€ 100			100
IFRS 15 revenue from contracts with customers [member]
Revenue [line items]
Decrease in Deferred revenue					€ 8,700			€ 8,700
[1] See Note 3 for details regarding the restatement as a result of a change in accounting policy.

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- Definition

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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