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Principal Accounting Policies (Narrative - Employee Benefits, Government Subsidies, Segment Reporting, Deferred offering costs (Details) ¥ in Thousands	12 Months Ended
	Dec. 31, 2015 CNY (¥) item	Dec. 31, 2014 CNY (¥)	Dec. 31, 2013 CNY (¥)
Employee Benefits
Employee benefit expenses	¥ 131,291	¥ 50,617	¥ 24,058
Government Subsidies
Government subsidies	¥ 12,175	¥ 6,902	¥ 1,689
Segment Reporting
Number of reportable segments | item	1

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The aggregate amount of expenditures for salaries, wages, profit sharing and incentive compensation, and other employee benefits, including equity-based compensation, and pension and other postretirement benefit expense.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.4)
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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Revenue earned during the period from non-repayable sum of money awarded to an entity to carry out a specific purpose as provided in grant agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(e))
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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