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REVENUE (Details) ¥ in Thousands	9 Months Ended
	Sep. 30, 2017 CNY (¥) customer	Sep. 30, 2016 CNY (¥) customer
Net revenue
Service revenue	¥ 1,098,197	¥ 703,284
Equipment sales	12,493	41,007
Net revenue	¥ 1,110,690	¥ 744,291
Revenue | Customer concentration
Net revenue
Number of customers generated over 10% of the Company's total revenues | customer	2	3
Revenue | Customer concentration | Customer One
Net revenue
Net revenue	¥ 256,373	¥ 114,715
Revenue | Customer concentration | Customer Two
Net revenue
Net revenue	¥ 113,669	105,909
Revenue | Customer concentration | Customer Three
Net revenue
Net revenue		¥ 72,626

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Number of customers arises the concentration risk due to the volume of business transacted.

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Revenue from the sale of equipment in the reporting period.

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- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ 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)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(d))
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