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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Concentration of credit risk (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2017 | Dec. 31, 2019 CNY (¥)
Foreign currency risk |  |  |  |
Cash and cash equivalents | $ 83,496 | ¥ 853,740 |  | ¥ 581,281
A |  |  |  |
Concentration of credit risk |  |  |  |
Concentration risk (as a percent) | 18.80% |  |  |
Foreign currency risk, Renminbi ("RMB") |  |  |  |
Foreign currency risk |  |  |  |
Cash and cash equivalents |  | ¥ 17,810 |  | ¥ 336,583
Accounts receivable |  |  |  |
Concentration of credit risk |  |  |  |
Concentration risk (as a percent) | 10.00% | 10.00% | 10.00% |
Product purchases | Suppliers risk | A |  |  |  |
Concentration of credit risk |  |  |  |
Concentration risk (as a percent) |  | 13.90% | 14.10% |
Product purchases | Suppliers risk | B |  |  |  |
Concentration of credit risk |  |  |  |
Concentration risk (as a percent) |  | 12.70% |  |
Accounts payable | Suppliers risk | A |  |  |  |
Concentration of credit risk |  |  |  |
Concentration risk (as a percent) |  | 18.90% |  |

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3044-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118951113&loc=d3e6676-107765 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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