Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Property and Equipment, Net (Details)

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Summary of Significant Accounting Policies - Property and Equipment, Net (Details)
12 Months Ended
Dec. 31, 2021
Property and equipment, net  
Leasehold improvements The shorter of lease terms and estimated useful lives
Building  
Property and equipment, net  
Useful lives 30 years
Computer equipment | Minimum  
Property and equipment, net  
Useful lives 3 years
Computer equipment | Maximum  
Property and equipment, net  
Useful lives 5 years
Furniture, fixtures and office equipment | Minimum  
Property and equipment, net  
Useful lives 3 years
Furniture, fixtures and office equipment | Maximum  
Property and equipment, net  
Useful lives 5 years
Software | Minimum  
Property and equipment, net  
Useful lives 3 years
Software | Maximum  
Property and equipment, net  
Useful lives 10 years
Motor vehicles  
Property and equipment, net  
Useful lives 5 years