Summary of Level 3 Inputs Measurement on Recurring Basis (Detail) (USD $)	9 Months Ended
Oct. 31, 2012
Fair Value, Measurement Inputs, Disclosure [Line Items]
Beginning Balance	$ 773,026
Additions
Exercises
Reclassification (Note 9)	(6,626,881)
Adjustment resulting from change in fair value recognized in earnings	5,853,855
Derivative
Fair Value, Measurement Inputs, Disclosure [Line Items]
Beginning Balance	653,026
Additions
Exercises
Reclassification (Note 9)	(5,818,149)
Adjustment resulting from change in fair value recognized in earnings	5,165,123
Warrant
Fair Value, Measurement Inputs, Disclosure [Line Items]
Beginning Balance	120,000
Additions
Exercises
Reclassification (Note 9)	(808,732)
Adjustment resulting from change in fair value recognized in earnings	$ 688,732

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Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Additions

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Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset and Liabilities, Derivative Adjustment

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Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset and Liabilities, Other

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Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Exercise of Derivative Warrants

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