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Share-based compensation - Schedule of changes in number of share options (Details) - Stock options
12 Months Ended
Dec. 31, 2021
Share
$ / shares
Dec. 31, 2020
Share
$ / shares
Dec. 31, 2019
Share
$ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Opening Balance | Share 1,693,063 1,454,943 485,159
Granted | Share 2,841,086 1,082,639 1,363,322
Exercised | Share   (22,382) (82,094)
Forfeited | Share (47,500)   (12,438)
Expired | Share (953,803)    
Cancelled | Share (307,987) (822,137) (299,006)
Closing Balance | Share 3,224,859 1,693,063 1,454,943
Exercisable | Share 3,197,601 1,528,186 1,200,242
Weighted average exercise price of share options outstanding in share-based payment arrangement at beginning of period | $ / shares $ 6.11 $ 21.96 $ 74.53
Weighted average exercise price, Granted | $ / shares 2.26 4.14 20.68
Weighted average exercise price, Exercised | $ / shares   2.61 10.02
Weighted average exercise price, Forfeited | $ / shares 4.83   56.28
Weighted average exercise price, Expired | $ / shares 4.87    
Weighted average exercise price, Cancelled | $ / shares 9.85 31.65 115.80
Weighted average exercise price of share options outstanding in share-based payment arrangement at end of period | $ / shares 2.75 6.11 21.96
Weighted average exercise price, Exercisable | $ / shares $ 2.72 $ 6.13 $ 21.24