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Share-Based Payments - Warrants (Details)
12 Months Ended
Jan. 04, 2021
kr / shares
Dec. 31, 2020
kr / shares
Dec. 31, 2019
kr / shares
Dec. 31, 2018
kr / shares
Aug. 10, 2020
kr / shares
Share-Based Payments          
Warrants as a percentage of outstanding shares   13.80% 13.50% 12.90%  
Warrants          
Share-Based Payments          
Vesting period   36 months      
Warrants granted   363,168 257,832 192,528  
Warrants granted, price per share   kr 1 kr 1 kr 1  
Warrants | CFO          
Share-Based Payments          
Warrants granted     150,660    
Ordinary shares          
Share-Based Payments          
Nominal value per share   kr 1 kr 1   kr 1
Ordinary shares | Stock Split          
Share-Based Payments          
Share split ratio 2        
Bonus issue share ratio 17        
Nominal value per share prior to stock split kr 2        
Nominal value per share kr 1        
Ordinary shares | Warrants | Stock Split          
Share-Based Payments          
Increase in number of warrants, ratio 36        
Warrants granted exercise price, prior to stock split kr 2        
Warrants granted, price per share kr 1