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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