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Share based compensation - Activities of options (Details) - 2021 Option Plan - $ / shares	1 Months Ended	5 Months Ended	12 Months Ended
	Jul. 31, 2021	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2021
Number of options
Outstanding at the beginning			13,281,043
Granted		13,575,733	2,354,744	13,575,733
Forfeited			(2,782,423)	(294,690)
Outstanding at the end		13,281,043	12,853,364	13,281,043
Vested and expected to vest as of December 31, 2021			12,853,364
Exercisable as of December 31, 2021			6,843,970
Weighted Average Exercise Price
Outstanding at the beginning			$ 9.70
Granted	$ 9.70		9.70	$ 9.70
Forfeited			9.70	9.70
Outstanding at the end		$ 9.70	9.70	9.70
Vested and expected to vest as of December 31, 2021			9.70
Exercisable as of December 31, 2021			9.70
Weighted Average Fair value at grant date
Outstanding at the beginning			2.92
Granted			3.39	2.92
Forfeited			2.31	2.92
Outstanding at the end		$ 2.92	3.14	$ 2.92
Vested and expected to vest as of December 31, 2021			3.14
Exercisable as of December 31, 2021			$ 2.92
Weighted remaining contractual years
Vested and expected to vest as of December 31, 2021			8 years 9 months 3 days
Exercisable as of December 31, 2021			8 years 8 months 1 day

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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