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Mezzanine equity - Information related to the Redeemable Convertible Preferred Shares (Details) ¥ / shares in Units, $ / shares in Units, ¥ in Thousands, $ in Thousands						1 Months Ended						2 Months Ended	4 Months Ended		5 Months Ended		12 Months Ended
	Jun. 29, 2021 CNY (¥)	Mar. 05, 2021 CNY (¥) ¥ / shares shares	Feb. 26, 2021 CNY (¥) shares	Jan. 16, 2020 CNY (¥) investor shares	Jan. 16, 2020 USD ($) investor $ / shares shares	Dec. 31, 2021 CNY (¥) investor shares	Dec. 31, 2021 USD ($) investor shares	Jul. 31, 2021 CNY (¥) shares	Jul. 31, 2021 USD ($) $ / shares shares	Mar. 31, 2021 shares	Jan. 31, 2020 CNY (¥) shares	Mar. 31, 2021 CNY (¥)	Dec. 31, 2021 CNY (¥) investor shares	Jun. 30, 2021 investor shares	Jul. 31, 2021 CNY (¥) investor day shares	Jul. 31, 2021 USD ($) investor day $ / shares shares	Dec. 31, 2023 CNY (¥)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 CNY (¥)	Dec. 31, 2021 CNY (¥) shares	Mar. 31, 2022 CNY (¥) shares	Mar. 31, 2022 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares	May 17, 2021 shares	Mar. 05, 2021 $ / shares	Jan. 31, 2020 USD ($)
Mezzanine equity
Number of investors | investor													2
Amount of excess of the ordinary shares' fair value over their par value | ¥																				¥ 81,208
Cash contribution to acquire equity method investment																	¥ 0	$ 0	¥ 79,442	1,145,637
Series A Preferred Shares
Mezzanine equity
Issuance of preferred shares (in shares)				26,841,535	26,841,535
Shares issued (In RMB or USD per share) | $ / shares					$ 6.71
Number of investors | investor				2	2
Total consideration for shares issued																	0	0	0	¥ 1,032,104
Issuance costs | ¥				¥ 8,500
Number of shares issuable (in shares)					22,367,946
Amount of deposits received				¥ 1,032,104	$ 150,000						¥ 1,032,104
Number of shares subscribed				22,367,946	22,367,946						22,367,946
Consideration for shares issuable											¥ 206,422															$ 30,000
Re-designation of ordinary shares to Series A Preferred Shares (in shares)			2,343,309
Amount of excess of the ordinary shares' fair value over their par value | ¥			¥ 81,208
Amount of excess of the preferred shares' fair value over the ordinary shares' fair value | ¥			¥ 16,452
Series Angel Preferred Shares
Mezzanine equity
Issuance of preferred shares (in shares)																				6,016,207
Shares issued (In RMB or USD per share) | (per share)		¥ 13.62																							$ 2.11
Total consideration for shares issued	¥ 81,950																0	0	0	¥ 81,950
Number of shares issuable (in shares)		6,016,207
Consideration for shares issuable | ¥		¥ 81,950
Shares issuable, percentage on outstanding shares		2.00%
Number of warrants to purchased shares exercised (in shares)																								6,016,207
Redeemable convertible preferred shares, liquidation preference | ¥		¥ 273,519
Fair value of warrant liabilities | ¥		¥ 191,569
Series A+ Preferred Shares
Mezzanine equity
Issuance of preferred shares (in shares)																				29,361,157
Total consideration for shares issued				¥ 1,238,526	$ 180,000												0	0	0	¥ 1,331,641
Series A+ Redeemable Convertible Preferred Shares
Mezzanine equity
Shares issued (In RMB or USD per share) | $ / shares									$ 9.70							$ 9.70						$ 7.04
Issuance costs | ¥												¥ 10,000
Number of shares issuable (in shares)																					29,361,157	29,361,157
Consideration for shares issuable																					¥ 1,331,641	$ 206,741
Series A++ Redeemable Convertible Preferred Shares
Mezzanine equity
Shares issued (In RMB or USD per share) | $ / shares									$ 8.31							$ 8.31
Number of investors | investor						4	4
Amount of deposits received						¥ 461,849									¥ 461,849	$ 71,000
Number of shares subscribed						8,546,916	8,546,916	8,546,916	8,546,916	8,546,916				8,546,916	8,546,916	8,546,916
Consideration for shares issuable						¥ 452,241			$ 71,000,000				¥ 452,241			$ 71,000,000				¥ 452,241			$ 71,000,000
Number of investors with whom share purchase agreements were entered | investor														4	4	4
Number of business days after the company received the deposits, within which the subscription amount is to be paid by the investors | day															5	5
Series B Preferred Shares
Mezzanine equity
Issuance of preferred shares (in shares)								9,882,082	9,882,082											17,615,165
Shares issued (In RMB or USD per share) | $ / shares																							$ 9.70
Total consideration for shares issued						¥ 324,270	$ 50,000										¥ 0	$ 0	¥ 159,485	¥ 324,270
Number of shares issuable (in shares)						7,733,083							7,733,083							7,733,083			7,733,083
Consideration for shares issuable | $																							$ 75,000
Cash contribution to acquire equity method investment | $									$ 10,649
Issuance of Series B Convertible Redeemable Preferred Shares in connection with acquisition of an equity-method investment (Note 8)								¥ 620,703	$ 95,800
Subscription receivable from Convertible Preferred Shares						¥ 159,392							¥ 159,392							¥ 159,392			$ 25,000

X

- Definition

Amount of decrease in Additional-paid-in capital due to re-designation of ordinary shares to Series A Preferred shares.

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It represents the amount of non cash activities of series B convertible redeemable preferred shares in connection with equity-method investment.

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Number of business days after the company received the deposits, within which the subscription amount is to be paid by the investors upon obtaining ODI approval.

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Represents the number of investors.

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Number of investors with whom share purchase agreements were entered into by the company.

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The cash outflow for cost incurred directly with the issuance of temporary equity.

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The cash inflow for refundable deposits in connection with temporary equity.

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Number of shares reduced due to re-designation of ordinary shares to Series A Preferred shares.

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Represents the consideration for shares issuable.

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The amount of excess of the preferred shares' fair value over the ordinary shares' fair value as share-based compensation expense.

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Represents the number of shares issuable.

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Represents the number of shares subscribed.

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Represents the percentage on outstanding shares for shares issued.

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Number of new stock classified as temporary equity issued during the period.

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The fair value of warrants.

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Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

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The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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The cash inflow from issuance of callable preferred stock which is identified as being convertible to another type of financial security at the option of the issuer or the holder.

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Per share or per unit amount of equity securities issued.

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The aggregate liquidation preference (or restrictions) of stock classified as temporary equity that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

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Aggregate monetary value of a new issue of securities which have been allocated to investors to buy. When security is sold on a subscription basis, the issuer does not initially receive the total proceeds. In general, the issuer does not issue the security to the investor until it receives the entire proceeds. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

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