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Summary of Status of Options Granted under Stock Option Plans and Changes in Options Outstanding (Detail) (Stock Option, USD $)
 3 Months Ended
Jan. 31, 2013
Stock Option
  
Shares  
Outstanding at November 1, 2012 2,004,781
Options granted 171,900
Options exercised (489,435)
Options canceled or expired (55,497)
Options outstanding at January 31, 2013 1,631,749
Options exercisable at January 31, 2013 1,191,255
Options vested and expected to vest at January 31, 2013 1,609,668
Weighted average exercise price  
Outstanding at November 1, 2012 $ 2.25
Options granted $ 4.76
Options exercised $ 2.68
Options canceled or expired $ 3.75
Options outstanding at January 31, 2013 $ 2.33
Options exercisable at January 31, 2013 $ 1.95
Options vested and expected to vest at January 31, 2013 $ 2.32