Commitments and Contingencies - Additional Information (Detail) (USD $)	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Commitments and Contingencies Disclosure [Line Items]
Rent Expense	$ 1,151,000	$ 1,369,000
Letters of credit, percentage of cash collateral	100.00%
Outstanding letters of credit	100,000	200,000
Defined contribution 401(k) retirement plan, employer contribution	$ 65,000	$ 64,000