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Long-term investments - Equity method investments (Details) $ / shares in Units, ¥ in Thousands, kr in Thousands, $ in Thousands |  |  | 1 Months Ended | 12 Months Ended |  |  |  |
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Sep. 01, 2021 CNY (¥) | Jul. 26, 2021 CNY (¥) shares | Jul. 26, 2021 USD ($) $ / shares shares | Aug. 31, 2024 CNY (¥) | Aug. 31, 2024 SEK (kr) | Dec. 31, 2023 CNY (¥) | Dec. 31, 2023 SEK (kr) | Nov. 30, 2023 CNY (¥) | Dec. 31, 2022 SEK (kr) | Jan. 31, 2022 CNY (¥) | Jul. 31, 2021 CNY (¥) | Jul. 31, 2021 SEK (kr) | Dec. 31, 2024 CNY (¥) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 CNY (¥) | Dec. 31, 2022 CNY (¥) | Jul. 31, 2024 | May 31, 2024 CNY (¥) | Jan. 31, 2024 | Aug. 31, 2021
Long-term investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash contribution to acquire equity method investment |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 53,900 | $ 7,384 | ¥ 0 | ¥ 79,442 |  |  |  |
Remeasured equity interest at fair value |  |  |  |  |  | ¥ 252,407 |  |  |  |  |  |  | 10,523 |  | 252,407 |  |  |  |  |
Gain as a result of deconsolidation |  |  |  |  |  |  |  |  |  | ¥ 71,974 |  |  | ¥ 0 | $ 0 | ¥ 0 | 71,974 |  |  |  |
Suzhou Photon-Matrix | Hubei ECARX |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest percentage |  |  |  |  |  |  |  |  |  |  |  |  | 13.10% |  |  |  | 0.69% |  | 13.10% |
SiEngine Technology Co., Ltd |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash contribution to acquire equity method investment |  | ¥ 68,967 | $ 10,600 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of shares issued to acquire equity method investment |  | 620,703 | 95,800 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying amount of the Company's controlling shareholder | $ |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Excess of consideration over the carrying amount of the equity investment |  | ¥ 689,670 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SiEngine Technology Co., Ltd | Series B Redeemable Convertible Preferred |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued to acquire equity method investment | shares |  | 9,882,082 | 9,882,082 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance price (in USD per share) | $ / shares |  |  | $ 9.70 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Volvo Cars |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash contribution to acquire equity method investment |  |  |  |  |  | ¥ 17,478 |  |  | kr 25,620 |  | ¥ 269,813 | kr 360,000 |  |  |  |  |  |  |  |
Equity interest (as a percent) |  |  |  |  |  | 60.00% |  |  |  |  | 40.00% | 40.00% |  |  | 60.00% |  |  |  |  |
ECARX HK |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash contribution to acquire equity method investment |  |  |  |  |  | ¥ 11,652 | kr 17,080 |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest (as a percent) |  |  |  |  |  | 40.00% |  |  |  |  |  |  |  |  | 40.00% |  |  |  |  |
Cash consideration for sale of equity method investment |  |  |  | ¥ 140,725 | kr 210,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain as a result of deconsolidation | kr |  |  |  |  | kr 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SiEngine Technology Co., Ltd |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest (as a percent) |  |  | 34.61% |  |  |  |  |  |  |  |  |  | 0.00% |  |  |  |  |  |  |
Equity interest sold (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  | 3.29% | 3.29% |  |  |  |  |  |
Cash consideration for sale of equity method investment |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 130,000 |  |  |  |  |  |  |
Hubei Dongjun Automotive Electronics Technology Co., Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash contribution to acquire equity method investment |  |  |  |  |  |  |  | ¥ 49,000 |  |  |  |  |  |  |  |  |  |  |  |
Equity interest (as a percent) | 49.00% |  |  |  |  |  |  | 49.00% |  |  |  |  |  |  |  |  | 51.00% | 49.00% |  | 51.00%
Equity interest sold (as a percent) | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration for sale of equity method investment | ¥ 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remeasured equity interest at fair value | 24,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 4,900 |  |
Gain as a result of deconsolidation | ¥ 10,579 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Suzhou Photon-Matrix |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest sold (as a percent) |  |  |  |  |  |  |  |  |  | 3.45% |  |  |  |  |  |  |  |  |  |
Cash consideration for sale of equity method investment |  |  |  |  |  |  |  |  |  | ¥ 10,000 |  |  |  |  |  |  |  |  |  |
Remeasured equity interest at fair value |  |  |  |  |  |  |  |  |  | ¥ 64,000 |  |  |  |  |  | 64,000 |  |  |  |
Gain as a result of deconsolidation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 71,974 |  |  |  |
Suzhou Photon-Matrix | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest (as a percent) |  |  |  |  |  |  |  |  |  | 50.92% |  |  | 62.27% |  |  |  |  |  |  |
Suzhou Photon-Matrix | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest (as a percent) |  |  |  |  |  |  |  |  |  | 49.17% |  |  |  |  |  |  |  |  |  |

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