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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
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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

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- Definition The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_25&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 35H -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_35H&doctype=Standard -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 35I -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_35I&doctype=Standard -URIDate 2017-03-09 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 35M -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_35M&doctype=Standard -URIDate 2017-03-09 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 35N -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_35N&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to deliver a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Financial instruments, class [member]; Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_25&doctype=Standard -URIDate 2017-03-09 + Details
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