Components of Property and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Mar. 31, 2016
Property Plant And Equipment [Abstract]
Machinery and equipment	$ 24,030	$ 25,211
Leasehold improvements	20,889	11,833
Capital lease assets	16,784
Furniture and fixtures	2,599	1,510
Construction in progress	15,046	3,712
Total cost	79,348	42,266
Less accumulated depreciation	(18,439)	(19,082)
Property and equipment, net	$ 60,909	$ 23,184