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FAIR VALUE MEASUREMENT - Listed equity securities (Details) ¥ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2020 USD ($)
FAIR VALUE MEASUREMENT |  |  |  |
Amount of shares received |  |  | ¥ 91,370 | $ 14,003,000
Unrealized gains | $ 4,744,000 | $ 1,048,000 |  |
Amount of shares carried at fair value | $ 20,195 |  |  | $ 15,056

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