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ADVANCES FROM CUSTOMERS (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Total $ 41,048 $ 35,182
Less: Advances from customers - short-term portion 37,783 33,028
Advances from customers - long-term portion 3,265 2,154
Customer A [Member]    
Total 12,323 4,184
Customer B [Member]    
Total 11,353 28,123
Customer C [Member]    
Total 8,320  
Other Customer [Member]    
Total $ 9,052 $ 2,875