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PREPAID EXPENSES AND OTHER CURRENT ASSETS (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
PREPAID EXPENSES AND OTHER CURRENT ASSETS      
Advances for purchasing cars $ 41,700 $ 25,017  
Others 1,924 2,569  
Total $ 43,624 $ 27,586 $ 38,714