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Long-term Borrowings - Additional Information (Detail) - EUR (€)
€ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
May 31, 2020
Mar. 31, 2020
Dec. 31, 2018
Dec. 31, 2017
Nov. 30, 2017
Jan. 31, 2017
Dec. 31, 2015
Disclosure Of Detailed Information About Borrowings [Line Items]                      
Long-term debt   € 17,439 € 16,426                
Liabilities directly related to assets held for sale     3,386                
Interest expense related to long-term borrowings   € 405 € 405 € 454              
Top of range [member]                      
Disclosure Of Detailed Information About Borrowings [Line Items]                      
Long-term debt interest rate   12.00% 12.00%                
Bottom Of Range [Member]                      
Disclosure Of Detailed Information About Borrowings [Line Items]                      
Long-term debt interest rate   3.00% 3.00%                
Six-month Euribor (360) plus a 2.5% spread long-term debt with final payment due August 2021 [member] | Top of range [member]                      
Disclosure Of Detailed Information About Borrowings [Line Items]                      
Net debt to EBITDA   3.00%                  
Six-month Euribor (360) plus a 2.5% spread long-term debt with final payment due August 2021 [member] | Bottom Of Range [Member]                      
Disclosure Of Detailed Information About Borrowings [Line Items]                      
Cash receipt turnover percentage   60.00%                  
Earnings before interest, taxes, depreciation and amortization (EBITDA) percentage   4.50%                  
Debt Service Cover Ratio   1.35%                  
Six-month Euribor (360) plus a 2.5% spread long-term debt with final payment due August 2021 [member] | Romanian subsidiary [member]                      
Disclosure Of Detailed Information About Borrowings [Line Items]                      
Long-term debt nominal amount                     € 10,000
Long-term debt maturity   August 2023                  
Long-term debt interest rate basis   Six-month Euribor (360)                  
Long-term debt interest rate spread   2.50%                  
Mortgage loan   € 16,628                  
Long-term debt   2,946                  
Long-term debt lump sum repayment   € 1,944                  
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]                      
Long-term debt nominal amount                     € 5,000
Long-term debt maturity   September 2021 September 2021                
Long-term debt interest rate basis   Three-month Euribor (360) Three-month Euribor (360)                
Long-term debt interest rate spread   4.00% 4.00%                
Long-term debt     € 750                
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]                      
Long-term debt nominal amount   € 139           € 1,000      
Long-term debt maturity   August 2022 August 2022                
Long-term debt interest rate basis   Three-month Euribor (360) Three-month Euribor (360)                
Long-term debt interest rate spread   2.20% 2.20%                
Long-term debt   € 139                  
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]                      
Long-term debt nominal amount                   € 2,500  
Long-term debt maturity   June 2022 June 2022                
Long-term debt interest rate basis   Three-month Euribor (360) Three-month Euribor (360)                
Long-term debt interest rate spread   3.50% 3.50%                
Long-term debt     € 750                
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]                      
Long-term debt nominal amount                 € 2,000    
Long-term debt maturity   June 2023 June 2023                
Long-term debt interest rate basis   Three-month Euribor (360) Three-month Euribor (360)                
Long-term debt interest rate spread   1.90% 1.90%                
Long-term debt   € 621 € 1,025                
2.3% fixed long-term debt with final payment due January 2026 [member]                      
Disclosure Of Detailed Information About Borrowings [Line Items]                      
Long-term debt nominal amount   € 7,000                  
Long-term debt maturity   January 2026 January 2026                
Long-term debt   € 4,518 € 5,562                
Long-term debt interest rate   2.30% 2.30%                
2.3% fixed long-term debt with final payment due January 2026 [member] | Matera [member]                      
Disclosure Of Detailed Information About Borrowings [Line Items]                      
Mortgage loan   € 14,000                  
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]                      
Long-term debt maturity   December 2022 December 2022                
Long-term debt interest rate basis   Six-month Euribor (360) Six-month Euribor (360)                
Long-term debt interest rate spread   2.75% 2.75%                
Long-term debt   € 92 € 183                
Six-months Euribor (360) plus a 2.75% spread long-term debt with final payment due December 2022 [member] | Romanian subsidiary [member]                      
Disclosure Of Detailed Information About Borrowings [Line Items]                      
Long-term debt interest rate basis   six-month Euribor (360)                  
Long-term debt interest rate spread   2.75%                  
Long-term debt   € 92         € 206        
0.21% fixed long-term debt with final payment due December 2030 [member]                      
Disclosure Of Detailed Information About Borrowings [Line Items]                      
Long-term debt nominal amount       4,181              
Long-term debt maturity   December 2030 December 2030                
Mortgage loan   € 13,936                  
Long-term debt   € 2,963 € 3,257                
Long-term debt interest rate   0.21% 0.21%                
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]                      
Long-term debt nominal amount       € 435              
Long-term debt maturity   January 2035 January 2035                
Long-term debt interest rate basis   Six-month Euribor (360) Six-month Euribor (360)                
Long-term debt interest rate spread   0.95% 0.95%                
Mortgage loan   € 3,000                  
Long-term debt   € 903 € 287                
Long-term debt interest rate   80.00% 80.00%                
No interest rate long-term debt with final payment due September 2027 [member]                      
Disclosure Of Detailed Information About Borrowings [Line Items]                      
Long-term debt maturity   September 2027 September 2027                
Long-term debt   € 395 € 378                
Long-term debt interest rate   0.00% 0.00%                
No interest rate long-term debt with final payment due September 2027 [member] | Swiss subsidiary [member]                      
Disclosure Of Detailed Information About Borrowings [Line Items]                      
Long-term debt nominal amount           € 378          
Long-term debt   € 395                  
Long-term debt interest rate   0.00%                  
11.76% Fixed long-term debt with final payment due October 2023 [member]                      
Disclosure Of Detailed Information About Borrowings [Line Items]                      
Long-term debt maturity   October 2023 October 2023                
Long-term debt   € 216 € 314                
Long-term debt interest rate   11.76% 11.76%                
11.76% Fixed long-term debt with final payment due October 2023 [member] | Brazilian subsidiary [member]                      
Disclosure Of Detailed Information About Borrowings [Line Items]                      
Long-term debt   € 216     € 314            
Long-term debt interest rate   11.76%                  
Six-month Euribor (360) plus a 2.75% spread long-term debt with final payment due March 2025                      
Disclosure Of Detailed Information About Borrowings [Line Items]                      
Long-term debt maturity   March 2025 March 2025                
Long-term debt interest rate basis   Six-month Euribor (360) Six-month Euribor (360)                
Long-term debt   € 4,646                  
Long-term debt interest rate   2.75% 2.75%                
Six-month Euribor (360) plus a 2.75% spread long-term debt with final payment due March 2025 | Romanian subsidiary [member]                      
Disclosure Of Detailed Information About Borrowings [Line Items]                      
Long-term debt interest rate basis   six-month Euribor (360)                  
Long-term debt interest rate spread   2.75%                  
Long-term debt € 5,000 € 4,646                  
Long-term debt state- guarantee percentage 90.00%                    
Three-month Euribor (360) [Member] | Top of range [member]                      
Disclosure Of Detailed Information About Borrowings [Line Items]                      
Long-term debt interest rate   4.00% 4.00%                
Three-month Euribor (360) [Member] | Bottom Of Range [Member]                      
Disclosure Of Detailed Information About Borrowings [Line Items]                      
Long-term debt interest rate   0.21% 0.21%                
Six-month Euribor (360) [Member] | Top of range [member]                      
Disclosure Of Detailed Information About Borrowings [Line Items]                      
Long-term debt interest rate   4.00% 4.00%                
Six-month Euribor (360) [Member] | Bottom Of Range [Member]                      
Disclosure Of Detailed Information About Borrowings [Line Items]                      
Long-term debt interest rate   0.21% 0.21%