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Intangible Assets - Summary of Intangible Assets (Detail) - EUR (€)
€ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of detailed information about intangible assets [line items]      
Intangible assets other than goodwill € 123 € 96 € 94
Total, gross [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets other than goodwill 864 572 356
Total accumulated amortization and depreciation [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets other than goodwill 741 476 262
Patents, licenses, trademarks [member] | Total, gross [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets other than goodwill 414 196 54
Patents, licenses, trademarks [member] | Total accumulated amortization and depreciation [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets other than goodwill 340 125 53
Software [member] | Total, gross [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets other than goodwill 450 376 302
Software [member] | Total accumulated amortization and depreciation [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets other than goodwill € 401 € 351 € 210