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PREPAID EXPENSES AND OTHER CURRENT ASSETS (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
PREPAID EXPENSES AND OTHER CURRENT ASSETS    
Prepaid training and other service fees $ 2,484 $ 2,126
Prepaid rental expenses 2,734 1,738
Prepayment expenses 1,136 384
Staff advances 597 774
Receivables from the disposal of subsidiaries 574 547
Prepayment for purchase of inventories 866 488
Prepayment for property, plant and equipment 865 2,304
Receivables from third party payment platform 82 181
Interest receivables 121  
Others 1,784 999
Prepaid expenses and other current assets $ 11,243 $ 9,541