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ACCOUNTS RECEIVABLE (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Accounts Receivable [Abstract]    
Accounts receivable $ 43,144 $ 24,608
Less: allowance for doubtful accounts 0 0
Total 43,144 24,608
Accounts receivable pledged as collateral for borrowings $ 0 $ 1,457