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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% |  |  |  |  |  |  |  |

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