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Share-based compensation - Schedule of changes in number of share options (Details) - Stock options
12 Months Ended
Dec. 31, 2019
Share
$ / shares
Dec. 31, 2018
Share
$ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Opening Balance | Share 485,159 206,219
Granted | Share 1,363,322 593,781
Exercised | Share (82,094) (240,214)
Forfeited | Share (12,438)  
Cancelled | Share (299,006) (74,627)
Closing Balance | Share 1,454,943 485,159
Exercisable | Share 1,200,242 253,815
Weighted average exercise price of share options outstanding in share-based payment arrangement at beginning of period | $ / shares $ 74.53 $ 4.44
Weighted average exercise price, Granted | $ / shares 20.68 65.80
Weighted average exercise price, Exercised | $ / shares 10.02 11.31
Weighted average exercise price, Forfeited | $ / shares 56.28  
Weighted average exercise price, Cancelled | $ / shares 115.80 10.05
Weighted average exercise price of share options outstanding in share-based payment arrangement at end of period | $ / shares 21.96 74.53
Weighted average exercise price, Exercisable | $ / shares $ 21.24 $ 19.91