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LONG-TERM BORROWINGS (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) Intallment	Dec. 31, 2020 USD ($)
Long-Term Borrowings [Abstract]
Less: Current portion	$ (1,598)	$ (1,591)
Long-term Borrowings	17,444	17,979
Principal Payments of Long-Term Loan [Abstract]
Interest expense related to long-term borrowings incurred	317
Interest expense charged to long-term borrowings	0
Capitalized interest charged as other long-term assets	317
China Merchants Bank [Member]
Long-Term Borrowings [Abstract]
Long-term debt	19,042	19,570
Less: Current portion	(1,598)	(1,591)
Long-term Borrowings	$ 17,444	17,979
Number of installments for loan repayable | Intallment	120
Last installment due date	Nov. 30, 2030
Annual interest rate	4.65%
Principal Payments of Long-Term Loan [Abstract]
2021	$ 1,191
2022	1,654
2023	1,733
2024	1,815
2025 and onwards	12,649
Long-term debt	$ 19,042	$ 19,570

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