Property Plant and Equipment - Additional Information (Detail) - USD ($)	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Property Plant And Equipment [Abstract]
Depreciation expense	$ 16,000	$ 47,000
Property, plant and equipment disposed, gross book value	19,000	6,000
Loss from disposal of property, plant and equipment	$ 1,000	$ 1,000