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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2017
Schedule of estimated useful lives of property and equipment
     Estimated useful life  

Electronic equipment

      2-3 years  

Office equipment and fixtures

      5 years  

Motor vehicles

      4 years  

Leasehold improvements

     
 Lesser of term of the lease or the
estimated useful lives of the assets		  
 
Schedule of estimated useful lives of intangible assets
     Estimated
useful life		  

Customer relationship

      2-6 years  

Trademarks

      3-10 years  

Technology

      1-10 years  

Online game licenses

      1-5 years  

User base

      1-3 years  

Domain names

      1-10 years  

Platform

      5 years