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Convertible redeemable preferred shares - Liquidation preferences (Details)	12 Months Ended
	Dec. 31, 2023
Series D1 Preferred Shares
Convertible redeemable preferred shares
Liquidation preference per share, Percentage of original issue price (in percent)	110.00%
Liquidation preference per share, Interest rate (in percent)	8.00%
Series D2 Preferred Shares
Convertible redeemable preferred shares
Liquidation preference per share, Percentage of original issue price (in percent)	110.00%
Liquidation preference per share, Interest rate (in percent)	8.00%
Series E Preferred Shares
Convertible redeemable preferred shares
Liquidation preference per share, Percentage of original issue price (in percent)	110.00%
Liquidation preference per share, Interest rate (in percent)	8.00%
Series C1 Preferred Shares
Convertible redeemable preferred shares
Liquidation preference per share, Percentage of original issue price (in percent)	100.00%
Liquidation preference per share, Interest rate (in percent)	8.00%
Series C2 Preferred Shares
Convertible redeemable preferred shares
Liquidation preference per share, Percentage of original issue price (in percent)	100.00%
Liquidation preference per share, Interest rate (in percent)	8.00%
Series A Preferred Shares
Convertible redeemable preferred shares
Liquidation preference per share, Percentage of original issue price (in percent)	100.00%
Liquidation preference per share, Interest rate (in percent)	6.00%
Series A+ Preferred Shares
Convertible redeemable preferred shares
Liquidation preference per share, Percentage of original issue price (in percent)	100.00%
Liquidation preference per share, Interest rate (in percent)	6.00%
Series B Preferred Shares
Convertible redeemable preferred shares
Liquidation preference per share, Percentage of original issue price (in percent)	100.00%
Liquidation preference per share, Interest rate (in percent)	6.00%
Series B+ Preferred Shares
Convertible redeemable preferred shares
Liquidation preference per share, Percentage of original issue price (in percent)	100.00%
Liquidation preference per share, Interest rate (in percent)	6.00%

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Represents the percentage of liquidation preference on original issue price.

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