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Company information - CTTQ (Details)
€ in Millions, $ in Millions
6 Months Ended
Jul. 19, 2023
USD ($)
$ / €
Jul. 19, 2023
EUR (€)
$ / €
Jun. 26, 2023
EUR (€)
May 25, 2023
May 22, 2023
USD ($)
May 22, 2023
EUR (€)
Jun. 30, 2023
USD ($)
Jun. 30, 2023
EUR (€)
Jun. 30, 2022
Jun. 30, 2023
EUR (€)
Licensing and collaboration agreement with CTTQ [Member]                    
Collaborative Arrangements                    
Amount Invoiced To Counterparty         $ 2.1 € 1.9 $ 2.1      
Amount Invoiced To Counterparty For Additional Payment         0.1 0.1        
Amount received attributable to withholding taxes $ 0.2 € 0.2         0.1      
Amount Invoiced To Counterparty For Initial Payment         $ 2.0 € 1.8        
Amount received on licensing arrangements $ 1.9 € 1.7                
Short-term potential milestone payment receivable             $ 3.0     € 2.8
Exchange rate on invoice 1.082 1.082         1.082     1.082
Contract CRO with Pharmaceutical Research Associates B.V.                    
Collaborative Arrangements                    
Bonus or malus maximum amount     € 2.4             € 3.4
Commitments amount payable for services received under contracts     € 207.0         € 223.8    
BSA 2023 plan                    
Collaborative Arrangements                    
Number of BSA issued       10,000         10,000  
AGA Plan 2023-1                    
Collaborative Arrangements                    
Number of BSA issued       300,000     300,000 300,000    
PAGUP 2023                    
Collaborative Arrangements                    
Number of BSA issued       300,000     300,000 300,000