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Financial and Other Non-Current Liabilities - Summary of Due Dates of the Financial Liabilities (Detail) - EUR (€)
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of financial liabilities [line items]      
Non-current conditional advances € 1,825,000 € 4,049,000 € 4,681,000
Current conditional advances 2,325,000 578,000 128,000
Supplier accounts payable and related payables 0    
Not Later Than One Year [member]      
Disclosure of financial liabilities [line items]      
Current conditional advances 2,325,000 578,000 128,000
Current financial rent debts   12,000 21,000
Other current liabilities 15,751,000 14,692,000  
Supplier accounts payable and related payables 16,941,000 13,720,000 10,034,000
Total financial liabilities 35,017,000 29,003,000 10,183,000
Later than one year and not later than five years [member]      
Disclosure of financial liabilities [line items]      
Non-current conditional advances 1,825,000 2,531,000 2,378,000
Non-current financial rent debts     12,000
Other non-current liabilities 8,421,000 10,370,000  
Total financial liabilities 10,246,000 12,900,000 2,391,000
2021 [member]      
Disclosure of financial liabilities [line items]      
Non-current conditional advances   1,518,000 2,302,000
Other non-current liabilities 448,000 377,000  
Total financial liabilities 448,000 1,895,000 2,302,000
Total, gross [member]      
Disclosure of financial liabilities [line items]      
Non-current conditional advances 1,825,000 4,049,000 4,681,000
Non-current financial rent debts     12,000
Other non-current liabilities 8,869,000 10,746,000  
Current conditional advances 2,325,000 578,000 128,000
Current financial rent debts   12,000 21,000
Other current liabilities 15,751,000 14,692,000  
Supplier accounts payable and related payables 16,941,000 13,720,000 10,034,000
Total financial liabilities € 45,711,000 € 43,798,000 € 14,876,000