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ORGANIZATION AND PRINCIPAL ACTIVITIES - VIEs and VIEs' major subsidiaries (Details)	Dec. 31, 2020
KAG
Schedule of Equity Method Investments [Line Items]
Percentage of legal ownership by Kaixin Auto Group	100.00%
Renren Finance, Inc
Schedule of Equity Method Investments [Line Items]
Percentage of legal ownership by Kaixin Auto Group	100.00%
Jet Sound Hong Kong Company Limited
Schedule of Equity Method Investments [Line Items]
Percentage of legal ownership by Kaixin Auto Group	100.00%
Shanghai Renren Financial Leasing Co., Ltd.
Schedule of Equity Method Investments [Line Items]
Percentage of legal ownership by Kaixin Auto Group	100.00%
Shanghai Renren Automotive Technology Group Co., Ltd.
Schedule of Equity Method Investments [Line Items]
Percentage of legal ownership by Kaixin Auto Group	100.00%
Shanghai Lingding Automobile Technology Co., Ltd.
Schedule of Equity Method Investments [Line Items]
Percentage of legal ownership by Kaixin Auto Group	100.00%

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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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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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