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Other liabilities (non-current and current) - Schedule of Other Liabilities (Detail) - EUR (€)
€ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Miscellaneous non-current liabilities [abstract]    
Advance payments for government grants € 1,069  
Lease incentives   € 960
Other   159
Total € 1,069 € 1,119