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Notes to the Consolidated Statements of Operations - Additional Information (Details) - EUR (€)
€ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Notes to the Consolidated Statements of Operations        
Revenue recognized € 7,579 € 20,146 € 14,708 € 44,519
Milestone revenues        
Notes to the Consolidated Statements of Operations        
Revenue recognized     755 5,321
Additional development milestone payments   10,000    
Development milestone payment included in contract liabilities 2,989   2,989  
GSK | Belgium        
Notes to the Consolidated Statements of Operations        
Revenue recognized € 6,283 € 19,295 € 12,756 € 43,041