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Inventory - Schedule of Inventory (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Mar. 31, 2016
Inventory Disclosure [Abstract]    
Raw materials $ 11,233 $ 9,665
Work-in-process 2,349 3,411
Finished goods 6,429 3,215
Deferred program costs 6,437 2,221
Net inventory $ 26,448 $ 18,512