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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
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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

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