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Other Non-current Receivables - Summary of Other Non-current Receivables (Detail) - EUR (€)
€ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Noncurrent Receivables [Abstract]    
Security deposits for lease contracts € 3,093 € 3,920
Receivable from disposal of assets 271 599
Total € 3,364 € 4,519