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Accounts receivable - Summary of Trade receivables (Detail) - EUR (€)
€ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Trade and other current receivables [abstract]    
Receivables From Collaboration Agreements € 1,250 € 957
Accounts receivable € 1,250 € 957 [1]
[1] See Note 2 for details regarding the change in presentation of Other financial assets