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Warrants (Detail)
 6 Months Ended
Jul. 31, 2013
Class of Warrant or Right [Line Items]  
Warrants outstanding 3,145,000
Weighted average remaining contractual life 3 years 6 months 14 days
Warrants Exercisable 3,145,000
Weighted average exercise price 0.2882
Warrant Exercise Price Range One 0.11485
  
Class of Warrant or Right [Line Items]  
Exercise Price 0.11485
Warrants outstanding 1,250,000
Weighted average remaining contractual life 3 years
Warrants Exercisable 1,250,000
Weighted average exercise price 0.1149
Warrant Exercise Price Range Two 0.11485
  
Class of Warrant or Right [Line Items]  
Exercise Price 0.11485
Warrants outstanding 250,000
Weighted average remaining contractual life 3 years
Warrants Exercisable 250,000
Weighted average exercise price 0.1149
Warrant Exercise Price Range Three 0.45000
  
Class of Warrant or Right [Line Items]  
Exercise Price 0.45000
Warrants outstanding 500,000
Weighted average remaining contractual life 3 years
Warrants Exercisable 500,000
Weighted average exercise price 0.4500
Warrant Exercise Price Range Four 0.50000
  
Class of Warrant or Right [Line Items]  
Exercise Price 0.50000
Warrants outstanding 100,000
Weighted average remaining contractual life 4 years 3 months
Warrants Exercisable 100,000
Weighted average exercise price 0.5000
Warrant Exercise Price Range Five 0.45000
  
Class of Warrant or Right [Line Items]  
Exercise Price 0.45000
Warrants outstanding 825,000
Weighted average remaining contractual life 4 years 6 months
Warrants Exercisable 825,000
Weighted average exercise price 0.4500
Warrant Exercise Price Range Six 0.40000
  
Class of Warrant or Right [Line Items]  
Exercise Price 0.40000
Warrants outstanding 220,000
Weighted average remaining contractual life 4 years 6 months 4 days
Warrants Exercisable 220,000
Weighted average exercise price 0.4000