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Inventory - Schedule of Inventory (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Mar. 31, 2015
Inventory Disclosure [Abstract]    
Raw materials $ 10,025 $ 9,411
Work-in-process 1,318 2,117
Finished goods 2,293 7,487
Deferred program costs 1,602 1,581
Net inventory $ 15,238 $ 20,596