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PREPAID EXPENSES AND OTHER CURRENT ASSETS (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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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

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