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Cash and Cash Equivalents - Summary of Cash and Cash Equivalents by Geographic Area (Detail) - EUR (€) € in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure of geographical areas [line items] |  |  |
Cash | € 54,475 | € 53,472 | € 48,187
Europe [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Cash | 32,779 | 36,550 |
China [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Cash | 15,355 | 9,938 |
North America [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Cash | 4,482 | 5,924 |
South America [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Cash | 1,498 | 786 |
Other [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Cash | € 361 | € 274 |

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