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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Revenues from different product groups and services (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended
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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

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