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Long-term investments - Equity securities (Details) ¥ in Thousands, $ in Thousands | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 28, 2024 CNY (¥) shares | Jun. 28, 2024 USD ($) shares | Jun. 30, 2024 CNY (¥) | Dec. 31, 2023 CNY (¥)
Long-term investments |  |  |  |
Equity securities | ¥ |  |  | ¥ 21,985 | ¥ 48,580
Equity securities, annual amount | ¥ 27,421 | $ 3,773 |  |
Luminar Technologies, Inc |  |  |  |
Long-term investments |  |  |  |
Equity securities (in shares) | shares | 2,030,374 | 2,030,374 |  |
Equity securities | $ |  | $ 3,025 |  |

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