Consolidated Balance Sheet Detail - Summary of Property and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Mar. 31, 2016
Property Plant And Equipment [Line Items]
Total property and equipment	$ 73,176	$ 63,295
Less: accumulated depreciation	(12,271)	(6,180)
Total property and equipment, net	60,905	57,115
Land [Member]
Property Plant And Equipment [Line Items]
Total property and equipment	1,271	1,480
Plant and Machinery [Member]
Property Plant And Equipment [Line Items]
Total property and equipment	43,690	42,375
Leasehold Improvements [Member]
Property Plant And Equipment [Line Items]
Total property and equipment	$ 28,215	$ 19,440