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Summary of Status of Options Granted under Stock Option Plans and Changes in Options Outstanding (Detail) (Stock Option, USD $)
 6 Months Ended
Apr. 30, 2014
Stock Option
  
Shares  
Options outstanding at November 1, 2013 988,215
Options granted 228,903
Options exercised (167,768)
Options canceled or expired (67,503)
Options outstanding at April 30, 2014 981,847
Options exercisable at April 30, 2014 651,868
Options vested and expected to vest at April 30, 2014 974,699
Weighted Average Exercise Price  
Options outstanding at November 1, 2013 $ 2.24
Options granted $ 6.39
Options exercised $ 2.76
Options canceled or expired $ 2.10
Options outstanding at April 30, 2014 $ 3.13
Options exercisable at April 30, 2014 $ 1.88
Options vested and expected to vest at April 30, 2014 $ 3.10