Warrants Outstanding (Detail) (USD $)	6 Months Ended
	Jul. 31, 2012
Class of Warrant or Right [Line Items]
Aggregate intrinsic value , warrants outstanding, beginning balance
Aggregate intrinsic value, warrats granted
Aggregate intrinsic value, warrants outstanding, ending balance
Number of warrants outstanding, beginning balance	1,500,000
Number of warrants granted
Number of warrants exercised
Number of warrants canceled
Number of warrants outstanding, ending balance	1,500,000