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Long-term Borrowings - Summary of Detailed Information About Loans Outstanding (Detail) - EUR (€)
€ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Detailed Information About Borrowings [Line Items]    
Total long-term borrowings € 16,426 € 18,412
Less current installments (7,124) (4,321)
Long-term borrowings 9,302 14,091
Six-month 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 borrowings   42
Six-month Euribor (360) plus a 2.5% spread long-term debt with final payment due August 2021 [member]    
Disclosure Of Detailed Information About Borrowings [Line Items]    
Total long-term borrowings 3,920 4,601
Three-month Euribor (360) plus a 4% spread long-term debt with final payment due September 2021 [member]    
Disclosure Of Detailed Information About Borrowings [Line Items]    
Total long-term borrowings 750 1,500
Three-month Euribor (360) plus a 2.2% spread long-term debt with final payment due August 2022 [member]    
Disclosure Of Detailed Information About Borrowings [Line Items]    
Total long-term borrowings   428
Three-month Euribor (360) plus a 3.5% spread long-term debt with final payment due June 2022 [member]    
Disclosure Of Detailed Information About Borrowings [Line Items]    
Total long-term borrowings 750 1,125
Three-month Euribor (360) plus a 1.9% spread long-term debt with final payment due June 2023 [member]    
Disclosure Of Detailed Information About Borrowings [Line Items]    
Total long-term borrowings 1,025 1,191
Six-months Euribor (360) plus a 2.75% spread long-term debt with final payment due December 2022 [member]    
Disclosure Of Detailed Information About Borrowings [Line Items]    
Total long-term borrowings 183  
11.76% Fixed long-term debt with final payment due October 2023 [member]    
Disclosure Of Detailed Information About Borrowings [Line Items]    
Total long-term borrowings 314  
2.3% fixed long-term debt with final payment due January 2026 [member]    
Disclosure Of Detailed Information About Borrowings [Line Items]    
Total long-term borrowings 5,562 6,075
No interest rate long-term debt with final payment due September 2027 [member]    
Disclosure Of Detailed Information About Borrowings [Line Items]    
Total long-term borrowings 378  
0.21% fixed long-term debt with final payment due December 2030 [member]    
Disclosure Of Detailed Information About Borrowings [Line Items]    
Total long-term borrowings 3,257 3,105
80% of six-months Euribor (360) plus a 0.95% spread long-term debt with final payment due January 2035 [member]    
Disclosure Of Detailed Information About Borrowings [Line Items]    
Total long-term borrowings € 287 € 345