Components of Property and Equipment (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Mar. 31, 2015
Property Plant And Equipment [Abstract]
Machinery and equipment	$ 25,211	$ 19,335
Furniture and fixtures	1,510	1,000
Leasehold improvements	11,833	2,874
Construction in progress	3,712	1,685
Total cost	42,266	24,894
Less accumulated depreciation	(19,082)	(15,767)
Property and equipment, net	$ 23,184	$ 9,127