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Intangible Assets - Additional Information (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Intangible Assets [Line Items]    
Growth rate 1.00%  
Non-current assets € 651,724 € 237,496
Subsidiaries | United States    
Disclosure Of Intangible Assets [Line Items]    
Non-current assets € 89,200 € 3,800
CGU Immunotherapies    
Disclosure Of Intangible Assets [Line Items]    
Recoverable amount period fifteen-year  
Discount rate cash flow projection 8.90%  
Growth rate extrapolated 1.00%  
External Product Sales of JPT    
Disclosure Of Intangible Assets [Line Items]    
Recoverable amount period ten-year  
Discount rate cash flow projection 7.90%  
Growth rate extrapolated 1.00%  
Increase in discount rate 9.40%