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Cash and Cash Equivalents - Summary of Cash and Cash Equivalents by Geographic Area (Detail) - EUR (€) € in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of geographical areas [line items] |  |  |
Cash | € 39,799 | € 62,131 | € 55,035
Europe [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Cash | 21,168 | 40,479 |
China [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Cash | 16,572 | 18,290 |
North America [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Cash | 1,317 | 2,857 |
South America [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Cash | 575 | 318 |
Other [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Cash | € 167 | € 187 |

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