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Share based compensation - Share Options Activity (Details) - $ / shares
 1 Months Ended 12 Months Ended
Aug. 31, 2021
Mar. 31, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Number          
Outstanding at beginning balance (in shares)     885,000    
Granted during the year (in shares)     5,150,000    
Forfeited during the year (in shares)     (105,500)    
Expired during in period (in shares)     (259,500)    
Outstanding at ending balance (in shares)     5,670,000 885,000  
Weighted Avg. Fair Value Price (in $)          
Outstanding at beginning balance (in dollars per share)     $ 1.91    
Granted during the year (in dollars per share)     0.51    
Forfeited during the year (in dollars per share)     1.24    
Expired during the year (in dollars per share)     3.19    
Outstanding at ending balance (in dollars per share)     $ 0.64 $ 1.91  
Share options          
Number          
Outstanding at beginning balance (in shares)     885,000 1,178,750 1,307,500
Granted during the year (in shares)     5,150,000 0 230,000
Forfeited during the year (in shares)     (105,500) (293,750) (358,750)
Expired during in period (in shares)     (259,500) 0 0
Outstanding at ending balance (in shares)     5,670,000 885,000 1,178,750
Exercisable (in shares)     411,244 572,000 405,500
Weighted Avg. Exercise Price (in $)          
Outstanding at beginning balance (in dollars per share)     $ 41.86 $ 41.84 $ 44.00
Granted during the year (in dollars per share) $ 2.00 $ 35.00 2.00 0 35.00
Forfeited during the year (in dollars per share)     23.21 41.78 44.68
Expired during the year (in dollars per share)     20.32 0 0
Outstanding at ending balance (in dollars per share)     5.66 41.86 41.84
Exercisable (in dollars per share)     $ 41.75 $ 40.54 $ 40.08