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Long-term Borrowings - Summary of Detailed Information About Loans Outstanding (Detail) - EUR (€) € in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2017
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Disclosure of detailed information about borrowings [line items] |  |  |
Total long-term debt | € 20,943 | € 25,717 | € 17,961
Less current installments | (10,582) | (4,840) | (11,632)
Long-term borrowings, excluding current installments | 10,361 | 20,877 | 6,329
0.74% long-term debt payable in annual installments with final payment due April 2018 [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total long-term debt |  | 520 | 1,035
6-months Euribor (360) plus a 2.5% spread long-term debt with final payment due August 2019 [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total long-term debt | 6,631 | 7,533 | 8,838
6-months Euribor (360) plus a 3.9% spread long-term debt with final payment due August 2019 [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total long-term debt | 893 | 2,186 | 3,426
3-months Euribor (360) plus a 4% spread long-term debt with final payment due August 2019 [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total long-term debt | 2,500 | 3,500 | 4,500
6-months Euribor (360) plus a 2.9% spread long-term debt with final payment due December 2020 [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total long-term debt | 83 | 123 | € 162
3-months Euribor (360) plus a 3,5% spread long-term debt with final payment due March 2022 [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total long-term debt | 1,625 | 2,063 |
3-months Euribor (360) plus a 2.2% spread long-term debt with final payment due February 2022 [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total long-term debt | 628 | 824 |
3-months Euribor (360) plus a 1.9% spread long-term debt with final payment due November 2022 [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total long-term debt | 1,583 | 1,968 |
2.3% long-term debt with final payment due June 2025 [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total long-term debt | € 7,000 | € 7,000 |

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