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PRINCIPAL ACCOUNTING POLICIES - Summary of property, equipment and software (Details)
6 Months Ended
Jun. 30, 2022
Leasehold improvement  
PRINCIPAL ACCOUNTING POLICIES  
Property, plant and equipment, estimated useful lives Shorter of lease term or estimated useful life of the assets
Furniture and fixtures  
PRINCIPAL ACCOUNTING POLICIES  
Property, plant and equipment, useful life 5 years
Software  
PRINCIPAL ACCOUNTING POLICIES  
Property, plant and equipment, useful life 5 years
Minimum | Electronic equipment  
PRINCIPAL ACCOUNTING POLICIES  
Property, plant and equipment, useful life 3 years
Minimum | Motor vehicles  
PRINCIPAL ACCOUNTING POLICIES  
Property, plant and equipment, useful life 3 years
Maximum | Electronic equipment  
PRINCIPAL ACCOUNTING POLICIES  
Property, plant and equipment, useful life 5 years
Maximum | Motor vehicles  
PRINCIPAL ACCOUNTING POLICIES  
Property, plant and equipment, useful life 5 years