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Financial Instruments - Fair Values and Risk Management - Summary of Trade Receivables Past Due (Detail) - EUR (€) € in Thousands | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
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Disclosure of detailed information about financial instruments [line items] |  |  |
Trade receivables | € 32,819 | € 33,304 | € 32,819
Gross carrying amount [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Trade receivables | 36,480 | 37,567 | € 36,480
Accumulated impairment [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Trade receivables | (3,661) | (4,263) |
Current (not past due) |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Trade receivables | 24,462 | 25,520 |
From 1 to 29 days past due |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Trade receivables | 3,945 | 4,707 |
From 30 to 60 days past due |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Trade receivables | 746 | 1,053 |
From 61 to 90 days past due |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Trade receivables | 582 | 429 |
More than 90 days past due |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Trade receivables | € 6,745 | € 5,858 |

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