Inventory - Schedule of Inventory (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016
Inventory Disclosure [Abstract]
Raw materials	$ 4,263	$ 9,665
Work-in-process	426	3,411
Finished goods	8,016	3,215
Deferred program costs	4,757	2,221
Net inventory	$ 17,462	$ 18,512