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Inventory - Schedule of Inventory (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Mar. 31, 2015
Inventory Disclosure [Abstract]    
Raw materials $ 8,820 $ 9,411
Work-in-process 1,805 2,117
Finished goods 3,954 7,487
Deferred program costs 1,571 1,581
Net inventory $ 16,150 $ 20,596