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Summarizes Activity of Level 3 Inputs Measured on Recurring Basis (Detail) (USD $) | 12 Months Ended
--- | ---
Jan. 31, 2013 | Jan. 31, 2012
Fair Value Of Level 3 Inputs Measured On Recurring Basis [Line Items] |  |
Balance | $ 773,026 | $ 0
Additions | 0 | 773,026
Exercises | 0 | 0
Reclassification (Note 6) | (6,626,881) |
Adjustment resulting from change in fair value recognized in earnings | 5,853,855 |
Balance | 0 | 773,026
Warrant |  |
Fair Value Of Level 3 Inputs Measured On Recurring Basis [Line Items] |  |
Balance | 120,000 | 0
Additions | 0 | 120,000
Exercises | 0 | 0
Reclassification (Note 6) | (808,732) |
Adjustment resulting from change in fair value recognized in earnings | 688,732 |
Balance | 0 | 120,000
Derivative |  |
Fair Value Of Level 3 Inputs Measured On Recurring Basis [Line Items] |  |
Balance | 653,026 | 0
Additions | 0 | 653,026
Exercises | 0 | 0
Reclassification (Note 6) | (5,818,149) |
Adjustment resulting from change in fair value recognized in earnings | 5,165,123 |
Balance | $ 0 | $ 653,026

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