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Financial and Other Non-Current Liabilities - Summary of Debt Recorded on Statement of Financial Position (Detail) (Detail) - EUR (€) |  |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2017 | Sep. 30, 2015 | Jan. 22, 2015 | Sep. 30, 2014 | Oct. 31, 2015 | Oct. 31, 2014 | Apr. 30, 2013 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2011
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  |  |  |  |  | € 4,628,000 | € 4,809,000 | € 4,047,000 |  |  |
Receipts |  |  |  |  |  |  |  |  |  | 865,000 |  |  |
Repayments |  |  |  |  |  |  |  | (578,000) | (275,000) | (192,000) |  |  |
Other transactions |  |  |  |  |  |  |  | 101,000 | 95,000 | 89,000 |  |  |
Ending balance |  |  |  |  |  |  |  | 4,150,000 | 4,628,000 | 4,809,000 | € 4,047,000 |  |
Of which - non-currentportion |  |  |  |  |  |  |  | 1,825,000 | 4,049,000 | 4,681,000 |  |  |
Of which - current portion |  |  |  |  |  |  |  | 2,325,000 | 578,000 | 128,000 |  |  |
3rd OSEO contract [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  |  |  |  |  | 192,000 | 318,000 | 507,000 |  |  |
Receipts |  |  |  |  |  |  |  |  |  |  | 128,000 | € 256,000 | € 256,000
Repayments |  |  |  |  |  |  |  | (128,000) | (128,000) | (192,000) |  |  |
Other transactions |  |  |  |  |  |  |  | 1,000 | 2,000 | 3,000 |  |  |
Ending balance |  |  |  |  |  |  |  | 64,000 | 192,000 | 318,000 | 507,000 |  |
4th OSEO contract [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  |  |  |  |  | 1,684,000 | 1,669,000 | 805,000 |  |  |
Receipts |  |  | € 864,989 |  | € 918,000 | € 903,500 | € 903,500 |  |  | 865,000 |  |  |
Other transactions |  |  |  |  |  |  |  | 16,000 | 16,000 | (2,000) |  |  |
Ending balance |  |  |  |  |  |  |  | € 1,700,000 | € 1,684,000 | € 1,669,000 | 805,000 |  |
Stated interest rate |  |  |  |  |  |  |  | 2.05% | 2.05% | 2.05% |  |  |
BPI advance [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  |  |  |  |  | € 2,751,000 | € 2,666,000 | € 2,584,000 |  |  |
Repayments | € (150,000) |  |  |  |  |  |  | (450,000) |  |  |  |  |
Other transactions |  |  |  |  |  |  |  | 84,000 | 85,000 | 82,000 |  |  |
Ending balance |  |  |  |  |  |  |  | € 2,386,000 | € 2,751,000 | € 2,666,000 | 2,584,000 |  |
Discount rate |  |  |  |  |  |  |  | 3.20% | 3.20% | 3.20% |  |  |
COFACE [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  |  |  |  |  |  | € 156,000 | € 151,000 |  |  |
Repayments |  |  |  |  |  |  |  |  | (147,000) |  |  |  |
Other transactions |  |  |  |  |  |  |  |  | € (9,000) | 5,000 |  |  |
Ending balance |  |  |  |  |  |  |  |  |  | € 156,000 | € 151,000 |  |
Discount rate |  |  |  |  |  |  |  |  | 4.25% | 4.25% |  |  |
Maturity (in years) |  |  |  |  |  |  |  |  | 0 | 0 |  |  |
Bottom of range [member] | 3rd OSEO contract [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate |  |  |  |  |  |  |  | 0.40% | 0.40% | 0.40% |  |  |
Maturity (in years) |  |  |  |  |  |  |  | 0 | 0 | 0 |  |  |
Bottom of range [member] | 4th OSEO contract [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate |  |  |  |  |  |  |  | 1.50% | 1.50% | 1.50% |  |  |
Maturity (in years) |  |  |  |  |  |  |  | 7 | 7 | 7 |  |  |
Bottom of range [member] | BPI advance [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity (in years) |  |  |  |  |  |  |  | 2 | 2 | 2 |  |  |
Top of range [member] | 3rd OSEO contract [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments |  | € (32,000) |  | € (64,000) |  |  |  |  |  |  |  |  |
Discount rate |  |  |  |  |  |  |  | 1.90% | 1.90% | 1.90% |  |  |
Maturity (in years) |  |  |  |  |  |  |  | 3 | 3 | 3 |  |  |
Top of range [member] | 4th OSEO contract [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate |  |  |  |  |  |  |  | 1.80% | 1.80% | 1.80% |  |  |
Maturity (in years) |  |  |  |  |  |  |  | 9 | 9 | 9 |  |  |
Top of range [member] | BPI advance [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity (in years) |  |  |  |  |  |  |  | 7 | 7 | 7 |  |  |
Scenario, Previously Reported [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  |  |  |  |  | € 4,627,000 |  |  |  |  |
Ending balance |  |  |  |  |  |  |  |  | € 4,627,000 |  |  |  |

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