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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 |  |  |  |  |
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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 |  |  |

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