Summary of Status of Options Granted under Stock Option Plans and Changes in Options Outstanding (Detail) (USD $)	12 Months Ended
	Oct. 31, 2014	Oct. 31, 2013
Shares
Option price range at beginning of year	$ 0.05	$ 0.05
Option price range at end of year	$ 6.91	$ 6.42
Aggregate intrinsic value of options exercised during year	$ 1,700,000
Stock Option
Shares
Options outstanding at beginning of year	988,215	2,004,781
Options granted	328,903	176,267
Options exercised	(204,683)	(1,096,750)
Options forfeited	(67,503)	(96,083)
Options outstanding at end of year	1,044,932	988,215
Options exercisable at end of year	748,843	743,169
Options vested and expected to vest at end of year	1,040,541	972,015
Aggregate intrinsic value of options exercised during year	$ 1,103,000	$ 4,137,000
Weighted Average Exercise Price
Options outstanding at beginning of year	$ 2.24	$ 2.25
Options granted	$ 5.83	$ 4.80
Options exercised	$ 2.80	$ 2.52
Options forfeited	$ 2.10	$ 4.01
Options outstanding at end of year	$ 3.27	$ 2.24
Options exercisable at end of year	$ 2.38	$ 1.96
Options vested and expected to vest at end of year	$ 3.25	$ 2.21