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Administrative Expenses - Summary of Administrative Expenses (Detail) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Selling General And Administrative Expense [Abstract]      
Labour costs € 15,578 € 19,060 € 20,023
Professional services costs 4,409 4,761 4,076
Indirect taxes 2,354 2,261 2,022
Depreciation and amortization 1,580 1,585 1,301
Software and office maintainance 1,502 1,385 1,312
Travel expenses 868 2,226 2,712
Directors and audit committee fees 736 831 801
Mail & Phone 523 622 675
Printing & Stationery 278 381 457
Cars costs 195 236 487
Electronic data processing 12 12 96
Government grants related to PPE (49) (163)  
Other 1,458 829 1,382
Total € 29,444 € 34,026 € 35,344