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Inventories - Schedule of Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 2,519 $ 4,276
Work in progress 5,267 8,435
Finished products 12,120 9,314
Total $ 19,906 $ 22,025