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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Product revenues and segment profit/(loss) (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended
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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)

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- 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a),(d)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
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- Definition Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1,2) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
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- Definition 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. + References No definition available. + Details
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- 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 + Details
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- Definition 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. + References No definition available. + Details
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