Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2012

Summary of Significant Accounting Policies [Abstract]

Property and equipment, estimated useful lives

Computer equipment and application software	3 years
Building	44 - 60 years
Office building related facility and machines	10 – 15 years
Furniture and vehicles	3 - 5 years
Leasehold improvements	lesser of the lease term or the estimated
	useful life of the assets

Acquired intangible assets, estimated useful lives

Domain names	3 - 10 years
Source code	5 - 8 years
Technology	3 - 10 years
Non-compete agreement	1 - 5 years
Trade mark	3 years
License of service provider	8 years

Concentration of credit risk

Details of the customers that account for 10% or more of total revenues are as follow:

	For the year ended December 31,
	2010			2011			2012
Customer
A		21	%		10	%		5	%
B		6	%		11	%		10	%

Details of the customers accounting for 10% or more of accounts receivable are as follows:

	December 31,
	2011			2012
Customer
A		10	%		-
B		24	%		29	%
C		8	%		12	%