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NET REVENUE - Disaggregation of revenues (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 (¥)
Disaggregation of revenues |  |  |  |
Net revenues | $ 567,677 | ¥ 3,952,053 | ¥ 1,785,970 | ¥ 959,486
Product |  |  |  |
Disaggregation of revenues |  |  |  |
Net revenues |  | 3,929,698 | 1,770,227 | 949,217
B2C segment |  |  |  |
Disaggregation of revenues |  |  |  |
Net revenues |  | 763,254 | 847,476 | 862,327
B2B segment |  |  |  |
Disaggregation of revenues |  |  |  |
Net revenues |  | 3,166,444 | 922,751 | 86,890
Service |  |  |  |
Disaggregation of revenues |  |  |  |
Net revenues |  | 22,355 | 15,743 | 10,269
MP Service |  |  |  |
Disaggregation of revenues |  |  |  |
Net revenues |  | 17,239 | 12,375 | 8,767
Other Services |  |  |  |
Disaggregation of revenues |  |  |  |
Net revenues |  | ¥ 5,116 | ¥ 3,368 | ¥ 1,502

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