Sales by Geographic Area (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2015	Apr. 30, 2014
Revenue, Major Customer [Line Items]
Sales revenue	$ 8,076	$ 5,764	$ 14,969	$ 11,614
United States
Revenue, Major Customer [Line Items]
Sales revenue	7,719	5,314	14,314	10,762
Canada
Revenue, Major Customer [Line Items]
Sales revenue	112	107	226	209
Israel
Revenue, Major Customer [Line Items]
Sales revenue	135	157	188	222
Mexico
Revenue, Major Customer [Line Items]
Sales revenue	95	136	189	258
All other
Revenue, Major Customer [Line Items]
Sales revenue	15	50	52	163
Foreign Countries, total
Revenue, Major Customer [Line Items]
Sales revenue	$ 357	$ 450	$ 655	$ 852