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Expenses by Nature - Summary of Depreciation and Amortization (Detail) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2017
Disclosure Of Depreciation And Amortization [line items]        
Amortisation of intangible assets € 917 € 910   € 1,569
Government grants (1,626) (1,061) € (1,068) (1,068)
Total depreciation and amortization 23,487 10,003   11,362
Cost of sales [member]        
Disclosure Of Depreciation And Amortization [line items]        
Depreciation 7,867 7,455   8,565
Amortisation of intangible assets 14 34   73
Government grants (1,463) (1,061)   (1,068)
Total depreciation and amortization 10,260 6,428   7,570
Cost of sales [member] | Right-of-use assets [member]        
Disclosure Of Depreciation And Amortization [line items]        
Depreciation 3,842  
Selling expenses [member]        
Disclosure Of Depreciation And Amortization [line items]        
Depreciation 9,084  
Amortisation of intangible assets     306
Total depreciation and amortization 11,805 2,274   2,124
Selling expenses [member] | Property, plant and equipment [member]        
Disclosure Of Depreciation And Amortization [line items]        
Depreciation 2,721 2,274   1,818
Selling expenses [member] | Intangible assets [member]        
Disclosure Of Depreciation And Amortization [line items]        
Amortisation of intangible assets      
Administrative expenses [member]        
Disclosure Of Depreciation And Amortization [line items]        
Amortisation of intangible assets 903 876   1,190
Government grants (163)  
Total depreciation and amortization 1,422 1,301   1,668
Administrative expenses [member] | Property, plant and equipment [member]        
Disclosure Of Depreciation And Amortization [line items]        
Depreciation 381 425   478
Administrative expenses [member] | Right-of-use assets [member]        
Disclosure Of Depreciation And Amortization [line items]        
Depreciation € 301