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Share based compensation - Activities of options (Details) - 2021 Option Plan - $ / shares	1 Months Ended		5 Months Ended	12 Months Ended
	Jan. 31, 2023	Jul. 31, 2021	Dec. 31, 2021	Dec. 31, 2023	Dec. 31, 2022
Number of options
Outstanding at the beginning (in shares)	12,853,364			12,853,364	13,281,043
Granted (in shares)	63,464		13,575,733	157,368	2,354,744
Forfeited (in shares)				(1,750,014)	(2,782,423)
Outstanding at the end (in shares)			13,281,043	11,260,718	12,853,364
Vested and expected to vest (in shares)				11,260,718
Exercisable (in shares)				8,815,574,000
Weighted Average Exercise Price
Outstanding at the beginning (in USD per share)	$ 9.70			$ 9.70	$ 9.70
Granted (in dollars per share)	9.70	$ 9.70		4.21	9.70
Forfeited (in USD per share)				9.70	9.70
Outstanding at the end (in USD per share)			$ 9.70	9.62	9.70
Vested and expected to vest (in USD per share)				9.62
Exercisable (in USD per share)				9.60
Weighted Average Fair value at grant date
Outstanding at the beginning (in USD per share)	$ 3.14			3.14	2.92
Granted (in USD per share)				3.12	3.39
Forfeited (in USD per share)				3.32	2.31
Outstanding at the end (in USD per share)			$ 2.92	3.11	$ 3.14
Vested and expected to vest (in USD per share)				3.11
Exercisable (in USD per share)				$ 2.94
Weighted remaining contractual years
Vested and expected to vest				7 years 8 months 23 days
Exercisable				7 years 8 months 19 days

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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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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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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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