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OTHER PAYABLE AND ACCRUED EXPENSES (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
OTHER PAYABLE AND ACCRUED EXPENSES [Abstract]
Lease expenses and payable for leasehold improvement due to a related party (note 11)	$ 0	$ 53
Accrued commissions	3,235	2,931
Accrued warranty	2,633	1,710
Accrued payroll	1,743	626
Accrued professional fees	176	64
Accrued machine testing fees	1,333	3,076
Accrued due to a related party (note 11)	1,990	0
Others	2,860	1,950
Total	$ 13,970	$ 10,410

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