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Share-based compensation - Schedule of Number of Awards Outstanding and Weighted Average Strike Price (Details)
 6 Months Ended 9 Months Ended
Jun. 30, 2023
shares
$ / shares
Sep. 30, 2023
shares
$ / shares
Share-based Payment Arrangements [Abstract]    
Average strike price in USD per share, At beginning of the year (in USD per share) | $ / shares $ 18.30 $ 18.30
Average strike price in USD per share, Granted (in USD per share) | $ / shares   2.39
Average strike price in USD per share, Option Exchange - Granted (in USD per share) | $ / shares   2.06
Average strike price in USD per share, Forfeited (in USD per share) | $ / shares   13.29
Average strike price in USD per share, Option Exchange - Forfeited (in USD per share) | $ / shares   22.55
Average strike price in USD per share, At end of the year (in USD per share) | $ / shares   $ 11.58
Number of awards, At beginning of the year (in shares) | shares 10,755,494 10,755,494
Number of awards, Granted (in shares) | shares   3,436,141
Number of awards, Option Exchange - Granted (in shares) | shares   898,585
Number of awards, Forfeited (in shares) | shares   (2,110,729)
Number of awards, Option Exchange - Forfeited (in shares) | shares   (2,197,458)
Number of awards, At end of the year (in shares) | shares   10,782,033
Weighted average remaining contractual life of outstanding share options 8 years 5 months 15 days 8 years 29 days
Weighted average remaining contractual life of granted share options   8 years 6 months 25 days
Weighted Average Remaining Contractual Life Of Option Exchange, Granted   8 years 6 months 25 days