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Fair Value Measurements (Detail) (USD $)	Jun. 30, 2013	Jun. 30, 2012
Fair Value Measurements [Line Items]
Warrant derivative liabilities	$ 143,000	$ 4,943,000
Fair Value, Inputs, Level 1
Fair Value Measurements [Line Items]
Warrant derivative liabilities	0	0
Fair Value, Inputs, Level 2
Fair Value Measurements [Line Items]
Warrant derivative liabilities	0	0
Fair Value, Inputs, Level 3
Fair Value Measurements [Line Items]
Warrant derivative liabilities	$ 143,000	$ 4,943,000

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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