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Company Information - Equity financing (Details)
12 Months Ended
Oct. 01, 2021
EUR (€)
€ / shares
shares
Sep. 23, 2021
$ / shares
shares
Aug. 02, 2021
USD ($)
Dec. 31, 2021
EUR (€)
shares
Dec. 31, 2020
EUR (€)
Dec. 31, 2019
EUR (€)
Sep. 27, 2021
USD ($)
shares
Jul. 15, 2020
EUR (€)
Disclosure of other provisions [line items]                
Issue of ordinary shares | €       € 25,426,000 € 109,099,000 € 8,903,000    
Share capital | €       € 409,000 € 386,000 € 268,000   € 383,930.11
Number of shares outstanding       40,873,551        
ADS                
Disclosure of other provisions [line items]                
Maximum aggregate sales proceeds | $     $ 100,000,000          
ATM                
Disclosure of other provisions [line items]                
Number of shares represented by one depositary receipt     1          
Percentage of dilution subject to regulatory limit     20.00%          
ATM | ADS                
Disclosure of other provisions [line items]                
Number of shares represented by one depositary receipt 1 1            
Issue of ADSs 130,856 2,083,334            
Funds raised, price per share | (per share) € 14.40 $ 14.40            
Share capital € 408,735.51           $ 407,426.95  
Number of shares outstanding 40,873,551           40,742,695