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Employee Benefit	12 Months Ended
	Dec. 31, 2017
Employee Benefit	22. EMPLOYEE BENEFIT Full time employees of the Group participate in government mandated defined contribution plan, pursuant to which certain welfare benefits are provided to employees. The Group has no legal obligation for the benefits beyond the contributions made. The total amounts for such employee benefits, which were expensed as incurred, were approximately RMB105,554, RMB152,231 and RMB175,508 (US$26,975) for the years ended December 31, 2015, 2016 and 2017, respectively.

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- Definition

The entire disclosure for pension and other postretirement benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-URI http://asc.fasb.org/topic&trid=2235017

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration