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INVENTORIES (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
INVENTORIES    
Raw materials $ 14,174 $ 14,868
Work-in-process 5,321 8,540
Finished goods 3,342 2,661
Gross inventories 22,837 26,069
Less: Reserve for excess and obsolete inventory (1,678) (1,850)
Net inventories $ 21,159 $ 24,219