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Other current and non-current assets -Summary of Other current assets (Detail) - EUR (€)
€ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Trade and other receivables [abstract]    
Grant receivable € 875 € 998
Prepaid expenses 2,389 1,236
Positive market value forward contract 914  
Value added tax receivable 798 768
Capitalized transaction costs   48
Other assets 787 617
Other current assets € 5,763 € 3,667 [1]
[1] See Note 2 for details regarding the change in presentation of Other financial assets