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Trade Receivables - Summary of Trade Receivables by Geographic Region (Detail) - EUR (€) € in Thousands | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
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Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |
Total trade receivables, net | € 32,819 | € 33,304 | € 32,819
Gross carrying amount [member] |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |
Total trade receivables, net | 36,480 | 37,567 | € 36,480
Gross carrying amount [member] | Italian Customers [Member] |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |
Total trade receivables, net | 6,633 | 8,349 |
Gross carrying amount [member] | Other European Customers |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |
Total trade receivables, net | 8,402 | 6,553 |
Gross carrying amount [member] | North American customers [member] |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |
Total trade receivables, net | 9,277 | 9,182 |
Gross carrying amount [member] | Chinese customers [member] |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |
Total trade receivables, net | 4,435 | 4,347 |
Gross carrying amount [member] | South American customers [member] |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |
Total trade receivables, net | 4,300 | 5,447 |
Gross carrying amount [member] | Other foreign customers [member] |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |
Total trade receivables, net | 3,433 | 3,689 |
Provision for doubtful accounts [member] |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |
Total trade receivables, net | € (3,661) | € (4,263) |

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