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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