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Share capital - Schedule of changes in number of warrants outstanding (Details) - $ / shares
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of Share based compensation and warrant reserve [Abstract]      
Warrants outstanding, Opening balance 6,749,109 467,451 546,212
Warrants, Issued 212,162 6,335,758 67,598
Warrants, Exercised     (12,167)
Warrants, Expired (4,476) (54,100) (134,192)
Warrants outstanding, Closing Balance 6,956,795 6,749,109 467,451
Weighted average exercise price, Warrants outstanding opening balance $ 5.62 $ 10.20 $ 9.47
Weighted average exercise price warrants issued 1.93 5.27 10.45
Weighted average exercise price warrants exercised     7.81
Weighted average exercise price warrants expired 5.43 4.97 7.64
Weighted average exercise price, Warrants outstanding closing balance $ 5.50 $ 5.62 $ 10.20