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Nature of the Business and Operations and Liquidity - Additional Information (Detail) (USD $)	1 Months Ended	6 Months Ended
	Jul. 31, 2013	Sep. 30, 2013	Sep. 30, 2012	Mar. 31, 2013	Mar. 31, 2012	Apr. 04, 2012 Senior Convertible Debt	Jun. 05, 2012 Senior Secured Term Loan
Description Of Business [Line Items]
Accumulated deficit		$ (825,266,000)		$ (800,131,000)
Cash and cash equivalents		25,867,000	49,136,000	39,243,000	46,279,000
Net cash (used in) operating activities		(14,779,000)	(24,965,000)
Debt, face amount						25,000,000	10,000,000
Reduction in global workforce, percentage	7.00%
Restructuring charge for severance and other costs		800,000
Interest rate percentage						7.00%
Reduction of principle from conversion of shares		$ 14,600,000

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Face (par) amount of debt instrument at time of issuance.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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