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OTHER PAYABLE AND ACCRUED EXPENSES (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
OTHER PAYABLE AND ACCRUED EXPENSES [Abstract]
Accrued commissions	$ 7,838	$ 7,127
Accrued warranty	4,196	3,975
Accrued payroll	4,422	3,068
Accrued professional fees	211	384
Accrued machine testing fees	1,632	1,595
Others	3,586	2,656
Total	$ 21,885	$ 18,805

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- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for machine testing fees.

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for professional fees, such as for legal and accounting services received. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for sales commissions. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Amount of liabilities incurred and payable to vendors for goods and services received classified as other, and expenses incurred but not yet paid, payable within one year or the operating cycle, if longer.

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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