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Long-term investments - Equity securities without readily determinable fair value (Details) - CNY (¥) ¥ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Long-term investments |  |  |
Change in year to year fair value gains on equity securities without readily determinable fair value | ¥ 2,652 | ¥ 94,711 | ¥ 0
Equity securities without readily determinable fair value: |  |  |
Initial cost | 9,477 | 143,209 |
Net cumulative fair value adjustments | 92,059 | 94,711 |
Carrying value | 101,536 | 237,920 |
Available-for-sale debt securities: |  |  |
Initial cost | 671,567 | 650,000 |
Net cumulative fair value adjustments | 977,294 | 30,723 |
Carrying value | ¥ 1,648,861 | ¥ 680,723 |

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