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Customer Accounts Receivable and Other Current Assets - Summary of Customer Accounts Receivable and Related Receivables (Detail) - EUR (€) € in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Trade and other receivables [abstract] |  |  |
Accounts receivable | € 1,265 | € 1,263 | € 13
Valuation allowance |  | (13) | € (13)
Total net value of accounts receivable | € 1,265 | € 1,250 |

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- Definition Valuation allowance customer account receivable. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The amount of current trade receivables and current other receivables. [Refer: Current trade receivables; Other current receivables] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 54 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_h&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 78 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_78_b&doctype=Standard -URIDate 2017-03-09 + Details
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Balance Type: | debit
Period Type: | instant

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