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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
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