Components of Property and Equipment (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Mar. 31, 2016
Property Plant And Equipment [Abstract]
Machinery and equipment	$ 27,045	$ 25,211
Capital lease assets	16,784
Leasehold improvements	10,863	11,833
Furniture and fixtures	2,117	1,510
Construction in progress	14,145	3,712
Total cost	70,954	42,266
Less accumulated depreciation	(20,747)	(19,082)
Property and equipment, net	$ 50,207	$ 23,184