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Inventories, Net - Schedule of Inventories, Net (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Raw materials and purchased parts $ 776 $ 977
Work in progress 3,792 2,727
Finished goods 4,692 536
Total inventories, net $ 9,260 $ 4,240