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Long-term investments - Equity investments using the measurement alternative (Details) ¥ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2022 CNY (¥) | Mar. 31, 2021 CNY (¥) item | Dec. 31, 2023 CNY (¥) | Dec. 31, 2022 CNY (¥) | Dec. 31, 2021 CNY (¥)
Long-term investments |  |  |  |  |
Initial cost basis |  |  | ¥ 49,500 | ¥ 40,000 | ¥ 30,000
Upward adjustments |  |  | 18,464 | 18,464 |
Total carrying value |  |  | 67,964 | 58,464 | 30,000
Impairment of long-term investments |  |  | 0 | 0 | 0
Long Term Investment Income [Member] |  |  |  |  |
Long-term investments |  |  |  |  |
Upward adjustments |  |  | ¥ 0 | ¥ 18,500 | ¥ 0
Beijing Sharetimes Technology Co., Ltd. |  |  |  |  |
Long-term investments |  |  |  |  |
Upward adjustments | ¥ 18,500 |  |  |  |
Number of Investors | item |  | 3 |  |  |
Percentage of investment held |  | 1.64% |  |  |
Investments made |  | ¥ 30,000 |  |  |

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- Definition This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481664/323-10-45-1 + Details
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