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LOAN RECEIVABLES (Details) - USD ($)
$ in Thousands
1 Months Ended
Aug. 31, 2018
Dec. 31, 2018
May 21, 2018
LOAN RECEIVABLES      
Loan amount, current   $ 582  
Allowance for loan loss for loan receivables   $ 0  
Shanghai Peidi's minority shareholder      
LOAN RECEIVABLES      
Loan amount, non-current $ 582    
Interest rate (as a percent) 7.00%    
Equity interest put forth as repayment guarantee (as a percent) 20.00%    
Loan agreement | Supplier      
LOAN RECEIVABLES      
Loan amount, current     $ 582