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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Disaggregation of revenue (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disaggregation of Revenue [Line Items]      
Total revenues $ 33,160 $ 334,697 $ 431,404
Automobile sales      
Disaggregation of Revenue [Line Items]      
Total revenues 32,996 332,634 420,005
Financing income      
Disaggregation of Revenue [Line Items]      
Total revenues     2,317
Others      
Disaggregation of Revenue [Line Items]      
Total revenues $ 164 $ 2,063 $ 9,082