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Fair Value Measurements (Details) (Recurring, USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Mar. 31, 2012
Total
Fair Value Measurements
Cash equivalents	$ 27,742	$ 39,790
Warrant liability	(10)	(791)
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value Measurements
Cash equivalents	27,742	39,790
Significant Unobservable Inputs (Level 3)
Fair Value Measurements
Warrant liability	$ (10)	$ (791)

Amount of 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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- Definition

Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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