OTHER PAYABLE AND ACCRUED EXPENSES (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
OTHER PAYABLE AND ACCRUED EXPENSES [Abstract]
Accrued commissions	$ 7,785	$ 4,082
Accrued warranty	3,449	2,811
Accrued payroll	2,960	2,092
Accrued professional fees	40	165
Accrued machine testing fees	1,481	1,456
Others	2,779	2,268
Total	$ 18,494	$ 12,874