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Inventories (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Jun. 30, 2017
Inventory [Line Items]    
Component parts $ 16,495 $ 16,638
Work-in-process 4,491 4,415
Finished product 7,948 9,526
Total Inventory 28,934 30,579
Current 24,533 26,212
Non-current 4,401 4,367
Total Inventory $ 28,934 $ 30,579