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Cash and Cash Equivalents - Summary of Cash and Cash Equivalents by Geographic Area (Detail) - EUR (€) € in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2017
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Disclosure of geographical areas [line items] |  |  |
Cash | € 62,131 | € 55,035 | € 64,981
Europe [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Cash | 40,479 | 30,984 | 21,635
China [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Cash | 18,290 | 20,724 | 40,174
North America [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Cash | 2,857 | 2,703 | 2,608
South America [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Cash | 318 | 551 | 374
Other [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Cash | € 187 | € 73 | € 190

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