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PRINCIPAL ACCOUNTING POLICIES - Additional Information (Details)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
CNY (¥)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
CNY (¥)
Foreign exchange gain/(loss), net ¥ 1,300 $ 204 ¥ 919 ¥ 12,397
Foreign currency translation adjustments ¥ (25,116) (3,941) (79,411) 33,298
Foreign Currency Exchange Rate 6,372.6000      
Inventories Written Down ¥ 25,696 4,032 40,609 3,608
Revenues 2,155,361 $ 338,223 5,530,257 11,672,024
Revenue, Remaining Performance Obligation 4,402   9,113  
Employee benefit expenses 273,773   403,031 553,175
Unrecognized uncertain tax positions 0   0  
Appropriated To Statutory Reserve 1,395   6,467 3,129
Factoring receivables ¥ 115,924   122,089  
General Reserve Fund [Member]        
Description Of Appropriations And Other Compliances Regarding Maintenance Of Statutory Reserves The appropriation to the general reserve fund must be at least 10% of the after-tax profits calculated in accordance with PRC GAAP. Appropriation is not required if the general reserve fund has reached 50% of the registered capital of the company. The appropriation to the general reserve fund must be at least 10% of the after-tax profits calculated in accordance with PRC GAAP. Appropriation is not required if the general reserve fund has reached 50% of the registered capital of the company.    
Statutory Surplus Fund [Member]        
Description Of Appropriations And Other Compliances Regarding Maintenance Of Statutory Reserves The appropriation to the statutory surplus fund must be 10% of the after-tax profits as determined under PRC GAAP. Appropriation is not required if the statutory surplus fund has reached 50% of the registered capital of the company. The appropriation to the statutory surplus fund must be 10% of the after-tax profits as determined under PRC GAAP. Appropriation is not required if the statutory surplus fund has reached 50% of the registered capital of the company.    
Membership program revenue        
Revenue, Remaining Performance Obligation ¥ 1,025   0  
Remaining Performance Obligation, Expected Timing of Satisfaction 12 months 12 months    
Membership program revenue | Gift Package [Member]        
Revenues ¥ 4,102   0 557,936
Sales of merchandise        
Revenues 1,798,882 $ 282,284 4,829,397 10,548,322
Revenue, Remaining Performance Obligation 99,213   40,645  
Referral Yunbi [Member]        
Upfront membership fees ¥ 0   ¥ 0 22,104
New Member Yunbi [Member]        
Upfront membership fees       ¥ 80,553