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DEFERRED REVENUE - Schedule of deferred revenue (Details) ¥ in Thousands, $ in Thousands | Dec. 31, 2021 CNY (¥) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 CNY (¥)
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Deferred revenue | ¥ 105,752 | $ 16,595 | ¥ 50,951
Deferred merchandise revenue [Member] |  |  |
Deferred revenue | 99,213 |  | 40,645
Deferred membership program revenue [Member] |  |  |
Deferred revenue | 1,025 |  | 0
Deferred marketplace revenue [Member] |  |  |
Deferred revenue | 4,402 |  | 9,113
Deferred other revenue [Member] |  |  |
Deferred revenue | ¥ 1,112 |  | ¥ 1,193

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- Definition Amount of deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(5)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Data Type: | na
Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |