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Common shares - Additional Information (Details)
12 Months Ended
Dec. 31, 2019
Vote
$ / shares
shares
Dec. 31, 2018
shares
Common shares    
Common stock, shares authorized 1,000,000,000  
Common stock, par value | $ / shares $ 0.00025  
Number of votes per common share | Vote 1  
Common stock, shares outstanding 339,165,241 336,522,780