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Financial Instruments - Fair Values and Risk Management - Additional Information (Detail) - EUR (€) € in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Jul. 31, 2015
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Disclosure of detailed information about financial instruments [line items] |  |  |
Unused credit lines | € 24,251 |  |
Current and non-current receivables | 1,780 | € 3,757 |
Cash and cash equivalents | € 39,799 | € 62,131 |
Fixed rate borrowings [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Borrowings at fixed rate | 49.90% | 33.40% |
Credit risk [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Percentage of insures the collections risk related to a significant portion of trade receivable | 80.00% |  |
Percentage of uncollected outstanding balances of trade receivable in case of insolvency | 85.00% |  |
Maximum amount of customer receivables to bank in exchange of short-term credit |  |  | € 47,500
Percentage of insured receivables | 15.00% |  |
Current and non-current receivables | € 12,242 | € 14,040 |

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- Definition The amount receivable by the entity that it does not separately disclose in the same statement or note. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 78 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_78_b&doctype=Standard -URIDate 2019-03-27 + Details
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