Summary of Status of Options Granted under Stock Option Plans and Changes in Options Outstanding (Detail) (Stock Option, USD $)	3 Months Ended
	Jan. 31, 2014
Stock Option
Shares
Options outstanding at November 1, 2013	988,215
Options granted	122,903
Options exercised	(109,763)
Options canceled or expired	(1,836)
Options outstanding at January 31, 2014	999,519
Options exercisable at January 31, 2014	658,978
Options vested and expected to vest at January 31, 2014	989,331
Weighted average exercise price
Options outstanding at November 1, 2013	$ 2.24
Options granted	$ 6.84
Options exercised	$ 3.12
Options canceled or expired	$ 4.05
Options outstanding at January 31, 2014	$ 2.70
Options exercisable at January 31, 2014	$ 1.78
Options vested and expected to vest at January 31, 2014	$ 2.67