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Stock Based Compensation (Detail) - Weighted average assumptions used in estimating the fair value of stock options granted (USD $)	3 Months Ended		12 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Oct. 31, 2012	Oct. 31, 2011
Weighted average fair value at grant date (in Dollars per share)	$ 0.17	$ 0.08	$ 0.18	$ 0.15
Expected life ( years)	5 years 43 days	1 year 219 days	5 years 9 months	3 years 109 days
Expected volatility	115.70%	124.00%
Risk-free interest rate	0.58%	0.20%
Expected dividend yield	0.00%	0.00%

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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