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Nature of the Business and Operations and Liquidity - Additional Information (Detail) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	3 Months Ended						3 Months Ended
	Jun. 30, 2014 Employee	Jun. 30, 2013	Mar. 31, 2014	Mar. 31, 2013	Jun. 05, 2012 Senior Secured Loan	Nov. 15, 2013 New Term Loan	Jun. 30, 2014 MLV & Co. LLC Atm Arrangement	Nov. 15, 2013 MLV & Co. LLC Atm Arrangement
Description Of Business [Line Items]
Accumulated deficit	$ (869,906,000)		$ (856,389,000)
Cash and cash equivalents	36,624,000	32,608,000	43,114,000	39,243,000
Net cash used in operating activities	(5,506,000)	(9,307,000)
Number of workforce persons	281
Debt, face amount					10,000,000	10,000,000
Common stock	816,000		789,000					30,000,000
Net proceeds from sale of common stock							1,200,000
Sale of common stock							0.8
Average sale price of share							$ 1.63
Common Stock, Value, Outstanding							$ 20,800,000

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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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