Summary Of Level 3 Inputs Measurement On Recurring Basis (Detail) (USD $)	6 Months Ended
	Jul. 31, 2012
Fair Value, Measurement Inputs, Disclosure [Line Items]
Beginning Balance	$ 773,026
Additions
Exercises
Adjustment resulting from change in fair value recognized in earnings	2,790,711	[1]
Ending Balance	3,563,737
Derivative
Fair Value, Measurement Inputs, Disclosure [Line Items]
Beginning Balance	653,026
Additions
Exercises
Adjustment resulting from change in fair value recognized in earnings	2,456,126	[1]
Ending Balance	3,109,152
Warrant
Fair Value, Measurement Inputs, Disclosure [Line Items]
Beginning Balance	120,000
Additions
Exercises
Adjustment resulting from change in fair value recognized in earnings	334,585	[1]
Ending Balance	$ 454,585

[1] The amount of total gains or losses for the period attributable to the change in unrealized gains or losses relating to liabilities held at the reporting date. The unrealized gain is recorded in unrealized gain on change in fair value of warrant and derivative liabilities in the accompanying condensed and consolidated statement of operations.