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Explanation of the Effects of Transition to International Financial Reporting Standards - Summary of Impacts of IFRS Adjustments for Trade Receivables (Detail) - EUR (€) € in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2017
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Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Trade receivables | € 40,967 | € 37,549 | € 40,138
Previous GAAP [member] |  |  |
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Trade receivables |  | 46,852 | 53,087
Effect of transition to IFRSs [member] |  |  |
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Trade receivables |  | (9,303) | (12,949)
Effect of transition to IFRSs [member] | Recognition of trade receivables [member] |  |  |
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Trade receivables |  | 6,287 | 6,275
Effect of transition to IFRSs [member] | Revenue of finished goods derecognised [member] |  |  |
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Trade receivables |  | (15,590) | (19,224)
IFRS [member] |  |  |
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Trade receivables |  | € 37,549 | € 40,138

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- Definition The amount of current trade receivables. [Refer: Trade receivables] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 78 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_78_b&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 68 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_68&doctype=Standard -URIDate 2018-03-16 + Details
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