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Accounts receivable
 12 Months Ended
Dec. 31, 2020
Text Block [Abstract]  
Disclosure Of Account Receivable Explanatory [Text Block]
7.
Accounts receivable
 
   
As of
 
   
December 31,

2020

   
December 31,

2019

 
   
(Euros in thousands)
 
Receivables from collaboration agreements
   1,250    957 
  
 
 
   
 
 
 
Accounts receivable
  
 
1,250
 
  
 
957
 
  
 
 
   
 
 
 
As of December 31, 2020, and 2019, no receivables were considered impaired.