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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Product revenues and segment profit/(loss) (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) segment	Dec. 31, 2019 CNY (¥) segment	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)
Segment reporting
Number of operating segment | segment	2	2
Product revenues	$ 567,677	¥ 3,952,053	¥ 1,785,970	¥ 959,486
Cost of products sold		(128,996)	(73,930)	(55,880)
Segment (loss)/profit		142,828	88,527	80,498
B2C segment
Segment reporting
Product revenues		763,254	847,476	862,327
Cost of products sold		(654,796)	(767,073)	(780,137)
Segment (loss)/profit		108,458	80,403	82,190
B2B segment
Segment reporting
Product revenues		3,166,444	922,751	86,890
Cost of products sold		(3,132,074)	(914,627)	(88,582)
Segment (loss)/profit		¥ 34,370	¥ 8,124	¥ (1,692)

X

- Definition

The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

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-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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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.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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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