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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
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