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Share capital - Schedule of changes in number of warrants outstanding (Details) - $ / shares
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of Share based compensation and warrant reserve [Abstract]    
Warrants outstanding, Opening balance 546,212 354,996
Warrants, Granted 67,598 236,148
Warrants, Exercised (12,167) (44,932)
Warrants, Expired (134,192)  
Warrants outstanding, Closing Balance 467,451 546,212
Weighted average exercise price, Warrants outstanding opening balance $ 9.47 $ 5.80
Weighted average exercise price warrants granted 10.45 16.57
Weighted average exercise price warrants exercised 7.81 17.79
Weighted average exercise price warrants expired 7.64  
Weighted average exercise price, Warrants outstanding closing balance $ 10.20 $ 9.47