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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Revenues from different product groups and services (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)
Segment reporting
Net revenues	$ 567,677	¥ 3,952,053	¥ 1,785,970	¥ 959,486
Product
Segment reporting
Net revenues		3,929,698	1,770,227	949,217
Drugs
Segment reporting
Net revenues		3,595,419	1,489,917	649,341
Nutritional supplements
Segment reporting
Net revenues		245,644	190,425	123,214
Contact lenses.
Segment reporting
Net revenues		18,110	47,295	107,275
Medical supplies and devices
Segment reporting
Net revenues		50,178	26,563	49,414
Other products.
Segment reporting
Net revenues		20,347	16,027	19,973
Service
Segment reporting
Net revenues		22,355	15,743	10,269
MP Service
Segment reporting
Net revenues		17,239	12,375	8,767
Other Services
Segment reporting
Net revenues		¥ 5,116	¥ 3,368	¥ 1,502

X

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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- Definition

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+ References

No definition available.

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