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Long-term investments - Equity securities (Details) $ / shares in Units, ¥ in Thousands, kr in Thousands, $ in Thousands |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jul. 01, 2021 CNY (¥) shares | Jul. 01, 2021 USD ($) shares | Jan. 31, 2023 USD ($) | May 31, 2022 CNY (¥) D shares | May 31, 2022 USD ($) D $ / shares shares | Apr. 30, 2022 CNY (¥) shares | Apr. 30, 2022 USD ($) shares | Apr. 30, 2022 SEK (kr) shares | Dec. 31, 2022 CNY (¥) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 CNY (¥) shares | Dec. 31, 2020 CNY (¥) | Dec. 20, 2022 $ / shares
Long-term investments |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment loss recognized | ¥ |  |  |  |  |  |  |  |  | ¥ 0 |  | ¥ 0 | ¥ 0 |
Consideration for disposal of investment |  |  |  |  |  |  |  |  |  | $ 115,000 |  |  |
Ordinary shares, par value per share | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.000005
Change in fair value of an equity security |  |  |  |  |  |  |  |  | ¥ (16,843) | $ (2,442) |  |  |
Luminar Technologies, Inc |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term investments |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of cash consideration |  |  |  |  | $ 15,000 |  |  |  |  |  |  |  |
Consideration transferred, equity interests issued and issuable |  |  |  |  | $ 15,000 |  |  |  |  |  |  |  |
Trading days | D |  |  |  | 20 | 20 |  |  |  |  |  |  |  |
Ordinary shares, par value per share | $ / shares |  |  |  |  | $ 0.0001 |  |  |  |  |  |  |  |
Asset retirement obligation liabilities settled (in shares) | shares |  |  |  | 2,030,374 | 2,030,374 |  |  |  |  |  |  |  |
Settlement of obligation |  |  |  |  | $ 12,588 |  |  |  |  |  |  |  |
Fair value of shares decreased |  |  |  |  | 10,050 |  |  |  |  |  |  |  |
Change in fair value of an equity security |  |  |  | ¥ 16,843 | $ 2,538 |  |  |  |  |  |  |  |
Common shares in Zenseact AB |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term investments |  |  |  |  |  |  |  |  |  |  |  |  |
Newly issued common shares subscribed | shares | 8,834 | 8,834 |  |  |  | 6,447 | 6,447 | 6,447 |  |  | 8,834 |  |
Equity interest acquired | 15.00% | 15.00% |  |  |  | 13.50% | 13.50% | 13.50% |  |  | 15.00% |  |
Cash consideration to acquire equity securities | ¥ 675,824 | $ 106,000 |  |  |  |  |  | kr 800,000 |  |  |  |  |
Investment's carrying amount gain |  |  |  |  |  | ¥ 35,153 | $ 5,297 |  |  |  |  |  |
Disposed investment consideration |  |  | $ 115,000 |  |  | 763,192 | 115,000 |  |  |  |  |  |
Gain of disposed investment consideration |  |  |  |  |  | ¥ 24,575 | $ 3,703 |  |  |  |  |  |

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