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LONG-TERM INVESTMENTS (Available-for-sale debt securities) (Details) - 12 months ended Dec. 31, 2020
¥ in Thousands, $ in Thousands
CNY (¥)
USD ($)
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale debt securities - Fair Value ¥ 80,000 $ 12,261
Private equity funds    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale debt securities - Fair Value ¥ 80,000  
Available-for-sale debt securities - Redemption frequency Annually  
Minimum | Private equity funds    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale debt securities - Redemption Notice Period 5 days  
Maximum | Private equity funds    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale debt securities - Redemption Notice Period 9 days