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v3.19.2

Revenue - Additional Information (Detail) - EUR (€) € in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Revenue [line items] |  |  |  |  |
Grant income |  | € 0.1 |  | € 0.2 |
Reduction in grant income | € 0.1 |  | € 0.1 |  |
Revenue recognized included in deferred revenue |  |  | 8.4 |  |
Revenue recognized not included in deferred revenue |  |  | 0.2 |  |
Incyte collaboration agreement [member] |  |  |  |  |
Revenue [line items] |  |  |  |  |
Up-front payment amortization | 4.0 | 4.0 | 7.9 | 7.9 |
ONO Research and License Agreement [member] |  |  |  |  |
Revenue [line items] |  |  |  |  |
Up-front payment amortization |  | 0.2 |  | 1.1 |
Simcere collaboration and license agreement [member] |  |  |  |  |
Revenue [line items] |  |  |  |  |
Up-front payment amortization | 0.1 | 0.1 | 0.3 | 0.1 |
Betta Pharmaceuticals Co Ltd [member] |  |  |  |  |
Revenue [line items] |  |  |  |  |
Up-front payment amortization | 0.1 |  | 0.2 |  |
ONO Research and License Agreement [member] |  |  |  |  |
Revenue [line items] |  |  |  |  |
Cost reimbursements | 0.0 | 0.1 | 0.1 | 0.2 |
Milestone revenue | 0.0 | 0.0 | 1.0 | 2.5 |
Payment terms related to receivables |  |  |  |  | 30 days
Simcere Pharmaceutical Co Ltd [member] |  |  |  |  |
Revenue [line items] |  |  |  |  |
Milestone revenue | 0.1 | 0.1 | 0.1 | 0.1 |
Payment terms related to receivables |  |  |  |  | 30 days
Betta Pharmaceuticals Co Ltd [member] |  |  |  |  |
Revenue [line items] |  |  |  |  |
Payment terms related to receivables |  |  |  |  | 60 days
Incyte collaboration agreement [member] |  |  |  |  |
Revenue [line items] |  |  |  |  |
Cost reimbursements | 1.4 | € 2.0 | 3.6 | € 4.3 |
Betta Research and License Agreement [member] | Top of range [member] |  |  |  |  |
Revenue [line items] |  |  |  |  |
Cost reimbursements | € 0.1 |  | € 0.1 |  |

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