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ORGANIZATION AND PRINCIPAL ACTIVITIES - Assets and liabilities of KAH upon the consummation of the SPAC Transaction (Details) - KAG - Reverse recapitalization - Nonrecurring
$ in Thousands
Dec. 31, 2020
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Cash $ 6
Prepaid expenses and other current assets 123
Others liabilities (1,512)
Net liabilities acquired by KAG as of April 30, 2019 (5,047)
Renren Inc.  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Amounts due to related parties (1,050)
SVF  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Amounts due to related parties $ (2,614)