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

Share capital - The changes in warrants (Details)

v3.21.1
Share capital - The changes in warrants (Details) - Warrants - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of classes of share capital [line items]    
Number of warrants, Warrants outstanding, beginning 20,603,396 22,369,718
Number of warrants, Warrants exercised (5,387,200) (1,116,322)
Number of warrants expired (145,313) (650,000)
Number of warrants, Warrants outstanding, ending 15,070,883 20,603,396
Weighted average exercise price, Warrants outstanding, beginning $ 3.57 $ 3.81
Weighted average exercise price, Warrants exercised 2.49 2.85
Weighted average exercise price, Warrants expired 1.49 15.35
Weighted average exercise price, Warrants outstanding, ending $ 4.01 $ 3.57