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Summary of Status of Options Granted under Stock Option Plans and Changes in Options Outstanding (Detail) (Stock Option, USD $)
 9 Months Ended
Jul. 31, 2013
Stock Option
  
Shares  
Outstanding at November 1, 2012 2,004,781
Options granted 176,267
Options exercised (877,728)
Options canceled or expired (80,902)
Options outstanding at July 31, 2013 1,222,418
Options exercisable at July 31, 2013 812,016
Options vested and expected to vest at July 31, 2013 1,197,118
Weighted average exercise price  
Outstanding at November 1, 2012 $ 2.25
Options granted $ 4.80
Options exercised $ 2.53
Options canceled or expired $ 4.07
Options outstanding at July 31, 2013 $ 2.29
Options exercisable at July 31, 2013 $ 1.81
Options vested and expected to vest at July 30, 2013 $ 2.27