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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 | 3 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 (¥) individual shares | Jan. 16, 2020 USD ($) individual $ / shares shares | Jul. 31, 2021 CNY (¥) shares | Jul. 31, 2021 USD ($) $ / shares shares | Mar. 31, 2021 CNY (¥) shares | Jan. 31, 2020 CNY (¥) shares | Mar. 31, 2021 CNY (¥) shares | Jun. 30, 2021 USD ($) shares | Jul. 31, 2021 CNY (¥) item D shares | Jul. 31, 2021 USD ($) item D $ / shares shares | Dec. 31, 2022 CNY (¥) shares | Dec. 31, 2022 USD ($) | Dec. 31, 2021 CNY (¥) item shares | Dec. 31, 2021 USD ($) item shares | Dec. 31, 2020 CNY (¥) shares | Dec. 31, 2022 USD ($) $ / shares shares | Dec. 31, 2021 USD ($) | May 17, 2021 shares | Mar. 31, 2021 USD ($) $ / shares shares | Mar. 05, 2021 $ / shares | Jan. 31, 2020 USD ($)
Mezzanine equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of excess of the ordinary shares' fair value over their par value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 81,208 |  |  |  |  |  |  |  |
Cash contribution to acquire equity method investment |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 79,442 | $ 11,518 | 1,345,637 |  |  |  |  |  |  |  |
Issuance of Series B Convertible Redeemable Preferred Shares in connection with acquisition of an equity-method investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 620,703 |  |  |  |  |  |  |  |
Series A Convertible Redeemable Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mezzanine equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of preferred shares (in shares) | shares |  |  |  | 26,841,535 | 26,841,535 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued, price per share | $ / shares |  |  |  |  | $ 6.71 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of investors | individual |  |  |  | 2 | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration for shares issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,032,104 |  | ¥ 206,422 |  |  |  |  |  |
Issuance costs |  |  |  | ¥ 8,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issuable | shares |  |  |  |  | 22,367,946 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of deposits received |  |  |  | ¥ 1,032,104 | $ 150,000 |  |  |  | ¥ 1,032,104 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares subscribed | shares |  |  |  | 22,367,946 | 22,367,946 |  |  |  | 22,367,946 |  |  |  |  |  |  |  |  | 26,841,535 |  |  |  |  |  |
Consideration for shares issuable |  |  |  |  |  |  |  |  | ¥ 206,422 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 30,000
Re-designation of ordinary shares to Series A Preferred Shares, Shares(Note 19) | 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable convertible preferred shares, liquidation preference |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | ¥ 1,336,186 |  |  |  |  |  |  |  |
Series Angel Convertible Redeemable Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mezzanine equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of preferred shares (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,016,207 | 6,016,207 |  |  |  |  |  |  |
Shares issued, price per share | (per share) |  | ¥ 13.62 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2.11 |
Total consideration for shares issued | ¥ 81,950 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 81,950 |  |  |  |  |  |  |  |
Number of shares issuable | 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 | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,016,207 |  |  |
Redeemable convertible preferred shares, liquidation preference |  | ¥ 273,519 |  |  |  |  |  |  |  |  |  |  |  | 0 |  | ¥ 273,519 |  |  |  |  |  |  |  |
Fair value of warrant liabilities |  | ¥ 191,569 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series A+ Convertible Redeemable Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mezzanine equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of preferred shares (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 29,361,157 | 29,361,157 |  |  |  |  |  |  |
Total consideration for shares issued |  |  |  | ¥ 1,238,526 | $ 180,000 |  |  |  |  |  |  |  |  |  |  | ¥ 1,331,641 |  |  |  |  |  |  |  |
Redeemable convertible preferred shares, liquidation preference |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | ¥ 1,331,641 |  |  |  |  |  |  |  |
Series A+ Redeemable Convertible Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mezzanine equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued, price per share | $ / shares |  |  |  |  |  |  | $ 9.70 |  |  |  |  |  | $ 9.70 |  |  |  |  |  |  |  |  | $ 7.04 |  |
Issuance costs |  |  |  |  |  |  |  |  |  | ¥ 10,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issuable | shares |  |  |  |  |  |  |  | 29,361,157 |  | 29,361,157 |  |  |  |  |  |  |  |  |  |  |  | 29,361,157 |  |
Consideration for shares issuable |  |  |  |  |  |  |  | ¥ 1,331,641 |  | ¥ 1,331,641 |  |  |  |  |  |  |  |  |  |  |  | $ 206,741 |  |
Series A++ Redeemable Convertible Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mezzanine equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued, price per share | $ / shares |  |  |  |  |  |  | $ 8.31 |  |  |  |  |  | $ 8.31 |  |  |  |  |  |  |  |  |  |  |
Number of investors | item |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 | 4 |  |  |  |  |  |  |
Amount of deposits received |  |  |  |  |  |  |  |  |  |  |  | ¥ 461,849 | $ 71,000 |  |  | ¥ 461,849 |  |  |  |  |  |  |  |
Number of shares subscribed | shares |  |  |  |  |  | 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 |  |  |  |  |  |  | $ 71,000,000 |  |  |  | $ 71,000,000 |  | $ 71,000,000 |  |  | ¥ 452,241 |  |  |  | $ 71,000,000 |  | $ 71,000,000 |  |
Number of investors with whom share purchase agreements were entered | item |  |  |  |  |  |  |  |  |  |  |  | 4 | 4 |  |  |  |  |  |  |  |  |  |  |
Number of business days after the company received the deposits, within which the subscription amount is to be paid by the investors | D |  |  |  |  |  |  |  |  |  |  |  | 5 | 5 |  |  |  |  |  |  |  |  |  |  |
Series B Convertible Redeemable Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mezzanine equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of preferred shares (in shares) | shares |  |  |  |  |  | 9,882,082 | 9,882,082 |  |  |  |  |  |  |  |  | 17,615,165 | 17,615,165 |  |  |  |  |  |  |
Shares issued, price per share | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9.70 |  |  |  |  |
Total consideration for shares issued |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 159,485 | $ 23,123 | ¥ 324,270 | $ 50,000 |  |  |  |  |  |  |
Number of shares issuable | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,733,083 |  |  |  |  | 7,733,083 |  |  |  |  |
Consideration for shares issuable | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 75,000 |  |  |  |  |
Cash contribution to acquire equity method investment | $ |  |  |  |  |  |  | $ 10,649 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable convertible preferred shares, liquidation preference |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 0 |  | 1,104,188 |  |  |  |  |  |  |  |
Issuance of Series B Convertible Redeemable Preferred Shares in connection with acquisition of an equity-method investment |  |  |  |  |  | ¥ 620,703 | $ 95,800 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subscription receivable from Convertible Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 159,392 |  |  |  | $ 25,000 |  |  |  |

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