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Share-Based Payments - Warrants Rectified (Details)
$ in Millions
 1 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
shares
Oct. 31, 2019
USD ($)
shares
Sep. 30, 2019
USD ($)
shares
Feb. 28, 2019
USD ($)
shares
Jan. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2020
USD ($)
Dec. 31, 2019
Dec. 31, 2018
USD ($)
Dec. 31, 2017
Employees                    
Share-Based Payments                    
Warrants outstanding           22,032   22,032 22,032  
Warrants                    
Share-Based Payments                    
Number of share options granted in share-based payment arrangement             363,168 257,832 192,528  
Warrants outstanding 2,228,076         1,674,324 2,228,076 1,932,156 1,674,324 1,481,796
Warrants | Employees and consultants                    
Share-Based Payments                    
Number of share options granted in share-based payment arrangement           99,216        
Warrants granted with immediate vesting           32,904        
Warrants Granted With Vesting Over The Next Three Years           66,312        
Weighted average fair value at measurement date, share options granted | $           $ 0.6     $ 0.6  
Warrants | Employees                    
Share-Based Payments                    
Warrants granted with immediate vesting     54,000              
Warrants Granted With Vesting Over The Next Three Years       7,956            
Weighted average fair value at measurement date, share options granted | $     $ 0.5 $ 0.1            
Warrants | Executive Management                    
Share-Based Payments                    
Warrants granted with immediate vesting           3,888        
Warrants Granted With Vesting Over The Next Three Years   150,660     45,216          
Weighted average fair value at measurement date, share options granted | $   $ 1.3     $ 0.3          
Service period   3 years                
Warrants | Board of Directors                    
Share-Based Payments                    
Warrants granted with immediate vesting           89,424        
Weighted average fair value at measurement date, share options granted | $           $ 0.5     $ 0.5  
2019 warrants entitlements                    
Share-Based Payments                    
Number of share options granted in share-based payment arrangement 126,972                  
Warrants granted with immediate vesting 63,612                  
Warrants Granted With Vesting Over The Next Three Years 63,360                  
Weighted average fair value at measurement date, share options granted | $ $ 1.2           $ 1.2      
Service period 3 years                  
2020 warrants entitlements                    
Share-Based Payments                    
Number of share options granted in share-based payment arrangement 236,196                  
Warrants granted with immediate vesting 120,888                  
Warrants Granted With Vesting Over The Next Three Years 115,308                  
Weighted average fair value at measurement date, share options granted | $ $ 2.3           $ 2.3      
Service period 3 years