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Basic and diluted earnings per share (Details) - shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Basic and diluted earnings per share      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 6,526,407 6,982,876 3,270,083
Warrants      
Basic and diluted earnings per share      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 37,175 37,175 37,175
Warrants | BMS      
Basic and diluted earnings per share      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 3,587,333 3,088,027  
Share options | 2012 Plan      
Basic and diluted earnings per share      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 483,006 1,077,944 1,527,782
Share options | 2014 Plan      
Basic and diluted earnings per share      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 1,812,766 1,448,226 1,068,750
Share options | Other Plans      
Basic and diluted earnings per share      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 187,500 1,152,436 457,308
RSUs and PSUs      
Basic and diluted earnings per share      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 418,627 179,068 179,068