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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Estimated Useful Lives of Property and Equipment (Details)
6 Months Ended
Jun. 30, 2022
Computer equipment  
Property, Plant and Equipment [Line Items]  
Estimated useful life 3 years
Office equipment  
Property, Plant and Equipment [Line Items]  
Estimated useful life 3 years
Software  
Property, Plant and Equipment [Line Items]  
Estimated useful life 4 years
Furniture, fixtures and equipment | Minimum  
Property, Plant and Equipment [Line Items]  
Estimated useful life 3 years
Furniture, fixtures and equipment | Maximum  
Property, Plant and Equipment [Line Items]  
Estimated useful life 7 years
Motor vehicles  
Property, Plant and Equipment [Line Items]  
Estimated useful life 4 years
Internal-use software development  
Property, Plant and Equipment [Line Items]  
Estimated useful life 3 years