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Financial Instruments Recognized in the Consolidated Statements of Financial Position and Related Effect on the Consolidated Statements of (Loss) - Schedule of Financial Instruments Recognized in the Consolidated Statements of Financial Position and Related Effect on the Consolidated Statements of (Loss) (Detail) - EUR (€)
€ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of Detailed Information About Financial Instruments [line items]      
Financial assets, fair value € 142,534 € 260,985 € 326,425
Financial liabilities, fair value 45,711 43,798 20,714
Long-term conditional advances [member]      
Disclosure of Detailed Information About Financial Instruments [line items]      
Financial liabilities, fair value     4,681
Long term financial rent debt [member]      
Disclosure of Detailed Information About Financial Instruments [line items]      
Financial liabilities, fair value     12
Short term conditional advances [member]      
Disclosure of Detailed Information About Financial Instruments [line items]      
Financial liabilities, fair value     128
Short term financial rent debt [member]      
Disclosure of Detailed Information About Financial Instruments [line items]      
Financial liabilities, fair value     21
Account payable and other liabilities [member]      
Disclosure of Detailed Information About Financial Instruments [line items]      
Financial liabilities, fair value     15,872
Carrying amount [member]      
Disclosure of Detailed Information About Financial Instruments [line items]      
Financial liabilities 45,711 43,798 20,714
Carrying amount [member] | Long-term conditional advances [member]      
Disclosure of Detailed Information About Financial Instruments [line items]      
Financial liabilities     4,681
Carrying amount [member] | Long term financial rent debt [member]      
Disclosure of Detailed Information About Financial Instruments [line items]      
Financial liabilities     12
Carrying amount [member] | Short term conditional advances [member]      
Disclosure of Detailed Information About Financial Instruments [line items]      
Financial liabilities     128
Carrying amount [member] | Short term financial rent debt [member]      
Disclosure of Detailed Information About Financial Instruments [line items]      
Financial liabilities     21
Carrying amount [member] | Account payable and other liabilities [member]      
Disclosure of Detailed Information About Financial Instruments [line items]      
Financial liabilities     15,872
Financial liabilities at amortised cost, category [member]      
Disclosure of Detailed Information About Financial Instruments [line items]      
Financial liabilities 45,711 43,798 20,714
Financial liabilities at amortised cost, category [member] | Long-term conditional advances [member]      
Disclosure of Detailed Information About Financial Instruments [line items]      
Financial liabilities     4,681
Financial liabilities at amortised cost, category [member] | Long term financial rent debt [member]      
Disclosure of Detailed Information About Financial Instruments [line items]      
Financial liabilities     12
Financial liabilities at amortised cost, category [member] | Short term conditional advances [member]      
Disclosure of Detailed Information About Financial Instruments [line items]      
Financial liabilities     128
Financial liabilities at amortised cost, category [member] | Short term financial rent debt [member]      
Disclosure of Detailed Information About Financial Instruments [line items]      
Financial liabilities     21
Financial liabilities at amortised cost, category [member] | Account payable and other liabilities [member]      
Disclosure of Detailed Information About Financial Instruments [line items]      
Financial liabilities     15,872
Long-term financial assets [member]      
Disclosure of Detailed Information About Financial Instruments [line items]      
Financial assets, fair value 3,012 2,745 2,711
Customer accounts receivables and related receivables [member]      
Disclosure of Detailed Information About Financial Instruments [line items]      
Financial assets, fair value 1,265 1,250  
Other current financial assets [member]      
Disclosure of Detailed Information About Financial Instruments [line items]      
Financial assets, fair value 378 516 333
Cash and cash equivalent [member]      
Disclosure of Detailed Information About Financial Instruments [line items]      
Financial assets, fair value 137,880 256,473 323,381
Long-term conditional advances [member]      
Disclosure of Detailed Information About Financial Instruments [line items]      
Financial liabilities, fair value 1,825 4,049  
Long-term conditional advances [member] | Carrying amount [member]      
Disclosure of Detailed Information About Financial Instruments [line items]      
Financial liabilities 1,825 4,049  
Long-term conditional advances [member] | Financial liabilities at amortised cost, category [member]      
Disclosure of Detailed Information About Financial Instruments [line items]      
Financial liabilities 1,825 4,049  
Other long term liabilities [member]      
Disclosure of Detailed Information About Financial Instruments [line items]      
Financial liabilities, fair value 8,869 10,746  
Other long term liabilities [member] | Carrying amount [member]      
Disclosure of Detailed Information About Financial Instruments [line items]      
Financial liabilities 8,869 10,746  
Other long term liabilities [member] | Financial liabilities at amortised cost, category [member]      
Disclosure of Detailed Information About Financial Instruments [line items]      
Financial liabilities 8,869 10,746  
Short term conditional advances [member]      
Disclosure of Detailed Information About Financial Instruments [line items]      
Financial liabilities, fair value 2,325 578  
Short term conditional advances [member] | Carrying amount [member]      
Disclosure of Detailed Information About Financial Instruments [line items]      
Financial liabilities 2,325 578  
Short term conditional advances [member] | Financial liabilities at amortised cost, category [member]      
Disclosure of Detailed Information About Financial Instruments [line items]      
Financial liabilities 2,325 578  
Short term financial rent debt [member]      
Disclosure of Detailed Information About Financial Instruments [line items]      
Financial liabilities, fair value   12  
Short term financial rent debt [member] | Carrying amount [member]      
Disclosure of Detailed Information About Financial Instruments [line items]      
Financial liabilities   12  
Short term financial rent debt [member] | Financial liabilities at amortised cost, category [member]      
Disclosure of Detailed Information About Financial Instruments [line items]      
Financial liabilities   12  
Other short term liabilities [member]      
Disclosure of Detailed Information About Financial Instruments [line items]      
Financial liabilities, fair value 15,751 14,692  
Other short term liabilities [member] | Carrying amount [member]      
Disclosure of Detailed Information About Financial Instruments [line items]      
Financial liabilities 15,751 14,692  
Other short term liabilities [member] | Financial liabilities at amortised cost, category [member]      
Disclosure of Detailed Information About Financial Instruments [line items]      
Financial liabilities 15,751 14,692  
Account payable and other liabilities [member]      
Disclosure of Detailed Information About Financial Instruments [line items]      
Financial liabilities, fair value 16,941 13,720  
Account payable and other liabilities [member] | Carrying amount [member]      
Disclosure of Detailed Information About Financial Instruments [line items]      
Financial liabilities 16,941 13,720  
Account payable and other liabilities [member] | Financial liabilities at amortised cost, category [member]      
Disclosure of Detailed Information About Financial Instruments [line items]      
Financial liabilities 16,941 13,720  
Carrying amount [member]      
Disclosure of Detailed Information About Financial Instruments [line items]      
Financial assets 142,534 260,985 326,425
Carrying amount [member] | Long-term financial assets [member]      
Disclosure of Detailed Information About Financial Instruments [line items]      
Financial assets 3,012 2,745 2,711
Carrying amount [member] | Customer accounts receivables and related receivables [member]      
Disclosure of Detailed Information About Financial Instruments [line items]      
Financial assets 1,265 1,250  
Carrying amount [member] | Other current financial assets [member]      
Disclosure of Detailed Information About Financial Instruments [line items]      
Financial assets 378 516 333
Carrying amount [member] | Cash and cash equivalent [member]      
Disclosure of Detailed Information About Financial Instruments [line items]      
Financial assets 137,880 256,473 323,381
Fair value through Consolidated Statements of (Loss) [member]      
Disclosure of Detailed Information About Financial Instruments [line items]      
Financial assets 139,213 257,783 324,746
Fair value through Consolidated Statements of (Loss) [member] | Long-term financial assets [member]      
Disclosure of Detailed Information About Financial Instruments [line items]      
Financial assets 1,333 1,310 1,365
Fair value through Consolidated Statements of (Loss) [member] | Cash and cash equivalent [member]      
Disclosure of Detailed Information About Financial Instruments [line items]      
Financial assets 137,880 256,473 323,381
Loans and receivables, category [member]      
Disclosure of Detailed Information About Financial Instruments [line items]      
Financial assets 3,321 3,202 1,679
Loans and receivables, category [member] | Long-term financial assets [member]      
Disclosure of Detailed Information About Financial Instruments [line items]      
Financial assets 1,679 1,435 1,346
Loans and receivables, category [member] | Customer accounts receivables and related receivables [member]      
Disclosure of Detailed Information About Financial Instruments [line items]      
Financial assets 1,265 1,250  
Loans and receivables, category [member] | Other current financial assets [member]      
Disclosure of Detailed Information About Financial Instruments [line items]      
Financial assets € 378 € 516 € 333