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ORGANIZATION AND PRINCIPAL ACTIVITIES - EBITDA (Details) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Apr. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Liabilities waived by Renren Inc. $ 76,007 $ (4,213) $ 76,007
Contribution from Renren Inc for contingent consideration $ 42,542   $ 42,542
Renren Inc.      
Earn out shares issued held in escrow 19,500,000 19,500,000  
Earnout Shares 19,500,000    
Business combination, contingent consideration arrangements, description   $13.00 for any sixty days in any period of ninety consecutive trading days during a fifteen-month period following the closing, and will receive all the 19.5 million Earnout Shares if the stock price of KAH is higher than $13.50 for any sixty days in any period of ninety consecutive trading days during a thirty-month period following the closing  
Renren Inc. | Gross revenue more than or equal 5000 millions      
Number of ordinary shares entitled from earn out shares 1,950,000,000,000    
Renren Inc. | Adjusted EBITDA is greater than or equal to RMB150 million      
Number of ordinary shares entitled from earn out shares 3,900,000,000,000    
Renren Inc. | Adjusted EBITDA is greater than or equal to RMB200 million      
Number of ordinary shares entitled from earn out shares 7,800,000,000,000    
Renren Inc. | Adjusted EBITDA is greater than or equal to RMB340 million      
Number of ordinary shares entitled from earn out shares 4,875,000,000,000    
Renren Inc. | Adjusted EBITDA is greater than or equal to RMB480 million      
Number of ordinary shares entitled from earn out shares 9,750,000,000,000