Property Plant and Equipment - Additional Information (Detail) (USD $)	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Property, Plant and Equipment [Line Items]
Depreciation expense	$ 106,000	$ 276,000
Property, plant and equipment disposed, gross book value	20,000	2,700,000
Gain (loss) from disposal of property, plant and equipment	$ (2,000)	$ 299,000