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Stock Option Transactions Under Stock Option Plans (Detail) (USD $)
 6 Months Ended
Jul. 31, 2012
Shares  
Beginning balance 1,150,000
Granted 1,000,000
Exercised   
Expired   
Forfeited   
Ending balance 2,150,000
Vested and expected to vest 1,483,333
Exercisable at end of period 1,350,000
Weighted-Average Per Share Exercise Price  
Beginning balance $ 0.15
Granted $ 0.15
Exercised   
Expired   
Forfeited   
Ending balance $ 0.15
Vested and expected to vest $ 0.15
Exercisable at end of period $ 0.15
Weighted-Average Remaining Contractual Term  
Beginning Balance 8 years 10 months 24 days
Granted 9 years 6 months
Balance at end of period 8 years 10 months 24 days
Vested and expected to vest 8 years 10 months 24 days
Exercisable at end of period 8 years 10 months 24 days
Aggregate Intrinsic Value  
Beginning Balance   
Granted   
Exercised   
Expired   
Forfeited   
Balance at end of period   
Vested and expected to vest   
Exercisable at end of period