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PRINCIPAL ACCOUNTING POLICIES - Additional information (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2020
CNY (¥)
item
segment
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2020
USD ($)
$ / ¥
Dec. 31, 2020
CNY (¥)
$ / ¥
Jan. 01, 2020
CNY (¥)
Significant Accounting Policies [Line Items]            
Foreign currency exchange rate | $ / ¥       6.5250 6.5250  
Number of reporting units | item 1          
Goodwill impairment loss ¥ 0 ¥ 0 ¥ 0      
Impairment charges of equity investments     2,000      
Impairment lossess to write off the loan receivable     3,432      
Revenue, Remaining Performance Obligation, Optional Exemption, Performance Obligation [true false] true          
Revenue, Remaining Performance Obligation, Optional Exemption, Variable Consideration [true false] true          
Advertising and marketing expenses ¥ 247,858 133,669 118,829      
Service period for Options and restricted share units granted to employees, including directors 4 years          
Lease, Practical Expedients, Package [true false] true          
ROU asset       $ 16,417 ¥ 107,120  
Operating lease liability         111,262  
Operating Leases, Rent Expense, Net   58,713 40,519      
Operating Lease, Cost ¥ 47,915          
Short-term Lease, Cost 13,548          
Sublease income   13,108 2,814      
Sublease Income ¥ 16,086          
Government grants   ¥ 72,660 ¥ 18,822   ¥ 58,520  
Number of operating segment | segment 1          
ASU 2016-02            
Significant Accounting Policies [Line Items]            
ROU asset           ¥ 125,010
Operating lease liability           ¥ 130,127