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Share Capital - Free Share Plans (Details)
12 Months Ended
Apr. 20, 2021
shares
patient
€ / shares
Apr. 01, 2021
EUR (€)
shares
Mar. 17, 2021
EUR (€)
shares
Jul. 27, 2020
EUR (€)
shares
Mar. 11, 2020
shares
€ / shares
Oct. 24, 2019
Mar. 29, 2019
shares
Jul. 27, 2018
shares
Mar. 06, 2018
shares
Dec. 31, 2021
EUR (€)
shares
employee
€ / shares
Dec. 31, 2020
EUR (€)
shares
€ / shares
Dec. 31, 2019
EUR (€)
€ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]                        
Par value per share (euro per share) | € / shares                   € 0.03 € 0.03 € 0.03
Capital increase, net | €   € 11,077.5 € 735 € 180           € 0 € 102,942,000 € 28,079,000
AGA 2021                        
Disclosure of terms and conditions of share-based payment arrangement [line items]                        
Issued (in shares) 362,515                 362,515    
AGA 2020                        
Disclosure of terms and conditions of share-based payment arrangement [line items]                        
Issued (in shares)         50,000         0 50,000  
AGA                        
Disclosure of terms and conditions of share-based payment arrangement [line items]                        
Issued (in shares)                   362,515 50,000  
Maximum term of options granted for share-based payment arrangement in the event of death or disability of optionee           6 months            
AGA 2018-1                        
Disclosure of terms and conditions of share-based payment arrangement [line items]                        
Issued (in shares)     24,500           396,250 0 0  
Vesting requirements for share-based payment arrangement, acquisition period     3 years                  
AGA 2019-1                        
Disclosure of terms and conditions of share-based payment arrangement [line items]                        
Issued (in shares)   369,250         438,250     0 0  
Vesting requirements for share-based payment arrangement, acquisition period   2 years                    
AGA 2018-2                        
Disclosure of terms and conditions of share-based payment arrangement [line items]                        
Issued (in shares)       6,000       6,000   0 0  
Vesting requirements for share-based payment arrangement, acquisition period       2 years                
Executive Board and Employees | AGA 2021                        
Disclosure of terms and conditions of share-based payment arrangement [line items]                        
Issued (in shares) 362,515                      
Par value per share (euro per share) | € / shares € 0.03                      
Vesting requirements for share-based payment arrangement, holding period 1 year                      
Vesting requirements for share-based payment arrangement, acquisition period 2 years                      
Vesting requirements, recommended dose determination, minimum number of patients | patient 2                      
Vesting requirements, recommended dose determination, total number of patients enrolled | patient 3                      
Executive Board and Employees | AGA 2020 and AGA 2021                        
Disclosure of terms and conditions of share-based payment arrangement [line items]                        
Vesting requirements for share-based payment arrangement, holding period         1 year              
Vesting requirements for share-based payment arrangement, acquisition period         2 years              
Vesting requirements for share-based payment arrangement, acquisition period for foreign tax residents         3 years              
Anne-Juliette Hermant | AGA 2020                        
Disclosure of terms and conditions of share-based payment arrangement [line items]                        
Issued (in shares)         50,000              
Par value per share (euro per share) | € / shares         € 0.03              
Employees | AGA                        
Disclosure of terms and conditions of share-based payment arrangement [line items]                        
Number of employees with service conditions lifted | employee                   7