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INVENTORIES (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw materials $ 16,428 $ 14,952
Work in process 5,978 5,547
Finished goods 5,840 7,323
Provision for excess and obsolete inventory (552) (512)
Total inventories $ 27,694 $ 27,310