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Accounting Principles - Additional Information (Detail) - EUR (€) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jul. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2018
Disclosure of summary of significant accounting policies [line Items] |  |  |  |  |
Research tax credit reimbursement |  | € 7,300,000 | € 5,700,000 | € 4,300,000 |
Tax credit reimbursement to be requested |  |  |  |  | € 9,200,000
Potential development, clinical, commercial milestones payment receivable | € 100,000,000 |  |  |  |
Non-refundable upfront payment | € 10,000,000 |  |  |  |
Deferred revenue |  | € 9,500,000 |  |  |
Bottom of range [member] | Software [member] |  |  |  |  |
Disclosure of summary of significant accounting policies [line Items] |  |  |  |  |
Depreciation periods |  | 1 year |  |  |
Top of range [member] | Software [member] |  |  |  |  |
Disclosure of summary of significant accounting policies [line Items] |  |  |  |  |
Depreciation periods |  | 3 years |  |  |

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