Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Share capital - The changes in warrants (Details)

v3.20.1
Share capital - The changes in warrants (Details) - Warrants - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of classes of share capital [line items]    
Number of warrants, Warrants outstanding, beginning 22,369,718 11,856,857
Number of warrants, Warrants issued 0 10,807,093
Number of warrants, Warrants exercised (1,116,322) (294,232)
Number of warrants expired (650,000)  
Number of warrants, Warrants outstanding, ending 20,603,396 22,369,718
Weighted average exercise price, Warrants outstanding, beginning $ 5.03 $ 4.70
Weighted average exercise price, Warrants issued 0.00 5.36
Weighted average exercise price, Warrants exercised 3.26 5.08
Weighted average exercise price, Warrants expired 19.93  
Weighted average exercise price, Warrants outstanding, ending $ 4.64 $ 5.03