Warrants Outstanding (Detail) (USD $)	9 Months Ended
	Oct. 31, 2012
Class of Warrant or Right [Line Items]
Aggregate intrinsic value , warrants outstanding, beginning balance
Aggregate intrinsic value, warrants granted
Aggregate intrinsic value, warrants outstanding, ending balance
Number of warrants outstanding, beginning balance	1,500,000
Number of warrants granted	2,100,000
Number of warrants exercised
Number of warrants canceled	(1,500,000)
Number of warrants outstanding, ending balance	2,100,000