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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%

X

- 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.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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