XML 57 R48.htm IDEA: XBRL DOCUMENT v3.19.2
Financial Liabilities - Summary of Debt Recorded on Statement of Financial Position (Detail) (Detail) - EUR (€)
€ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Disclosure of detailed information about borrowings [line items]      
Beginning balance € 2,479 € 4,150 € 4,150
Receipts 0 0 0
Repayments (932)   (1,800)
Other transactions 29   129
Ending balance 1,575   2,479
Of which - Non-current portion 1,003   1,278
Of which - Current portion 572   1,201
3rd OSEO contract [member]      
Disclosure of detailed information about borrowings [line items]      
Beginning balance   64 64
Receipts 0   0
Repayments     (64)
4th OSEO contract [member]      
Disclosure of detailed information about borrowings [line items]      
Beginning balance 624 1,700 1,700
Receipts 0   0
Repayments (632)   (1,136)
Other transactions € 8   60
Ending balance     624
Stated interest rate 2.05%    
BPI advance [member]      
Disclosure of detailed information about borrowings [line items]      
Beginning balance € 1,854 € 2,386 2,386
Receipts 0   0
Repayments (300)   (600)
Other transactions 21   69
Ending balance € 1,575   1,854
Discount rate 3.20%    
Bottom of range [member] | 3rd OSEO contract [member]      
Disclosure of detailed information about borrowings [line items]      
Receipts € 0   0
Discount rate 0.40%    
Maturity (in years) 0    
Bottom of range [member] | 4th OSEO contract [member]      
Disclosure of detailed information about borrowings [line items]      
Receipts € 0   0
Discount rate 1.50%    
Maturity (in years) 7    
Bottom of range [member] | BPI advance [member]      
Disclosure of detailed information about borrowings [line items]      
Receipts € 0   0
Maturity (in years) 2    
Top of range [member] | 3rd OSEO contract [member]      
Disclosure of detailed information about borrowings [line items]      
Receipts € 0   0
Discount rate 1.90%    
Maturity (in years) 3    
Top of range [member] | 4th OSEO contract [member]      
Disclosure of detailed information about borrowings [line items]      
Receipts € 0   0
Discount rate 1.80%    
Maturity (in years) 9    
Top of range [member] | BPI advance [member]      
Disclosure of detailed information about borrowings [line items]      
Receipts € 0   € 0
Maturity (in years) 7