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INVENTORIES (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
INVENTORIES    
Raw materials $ 16,394 $ 11,945
Work-in-process 5,426 6,305
Finished goods 2,958 3,538
Gross inventories 24,778 21,788
Less: Reserve for excess and obsolete inventory (2,108) (2,509)
Net inventories $ 22,670 $ 19,279