Stock Option Transactions Under Stock Option Plans (Detail) (USD $)	9 Months Ended
	Oct. 31, 2012
Shares
Beginning balance	1,150,000
Granted	4,075,000
Exercised
Expired
Forfeited
Ending balance	5,225,000
Vested and expected to vest	2,608,336
Exercisable at end of period	2,541,669
Weighted-Average Per Share Exercise Price
Beginning balance	$ 0.15
Granted	$ 0.19
Exercised
Expired
Forfeited
Ending balance	$ 0.18
Vested and expected to vest	$ 0.18
Exercisable at end of period	$ 0.18
Weighted Average Remaining Life (Years)
Beginning Balance	8 years 10 months 24 days
Granted	9 years 8 months 12 days
Balance at end of period	9 years 4 months 24 days
Vested and expected to vest	9 years 4 months 24 days
Exercisable at end of period	9 years 4 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