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SHARE-BASED COMPENSATION - Kaixin Auto Group 2018 Plan (Details) - shares
12 Months Ended
Jul. 01, 2018
Mar. 15, 2018
Dec. 31, 2017
Dec. 31, 2019
May 31, 2018
Jan. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Ordinary shares available for future grant       4,200,000    
Kaixin Auto Group 2018 Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Ordinary shares available for future grant         21,868,000 6,248,000
Options granted 5,695,286 5,695,286        
Kaixin Auto Group 2018 Plan | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Term of the options     P10Y