Sales by Geographic Area (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2015	Jul. 31, 2014
Revenue, Major Customer [Line Items]
Sales revenue	$ 8,899	$ 5,536	$ 23,868	$ 17,150
United States
Revenue, Major Customer [Line Items]
Sales revenue	8,573	5,148	22,887	15,897
Canada
Revenue, Major Customer [Line Items]
Sales revenue	64	91	290	310
Israel
Revenue, Major Customer [Line Items]
Sales revenue	76	65	264	287
Mexico
Revenue, Major Customer [Line Items]
Sales revenue	135	132	324	390
All other
Revenue, Major Customer [Line Items]
Sales revenue	51	100	103	266
Foreign Countries, total
Revenue, Major Customer [Line Items]
Sales revenue	$ 326	$ 388	$ 981	$ 1,253