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Summary of Status of Options Granted under Stock Option Plans and Changes in Options Outstanding (Detail) (USD $)
 9 Months Ended
Jul. 31, 2012
Shares  
Beginning balance 2,099,672
Options granted 78,500
Options exercised (103,788)
Options canceled or expired (8,000)
Ending balance 2,066,384
Options exercisable at end of the period 1,544,140
Options vested and expected to vest at end of the period 3,397,716
Weighted average exercise price  
Beginning balance $ 2.13
Options granted $ 3.74
Options exercised $ 1.36
Options canceled or expired $ 3.22
Options outstanding at end of the period $ 2.22
Options exercisable at end of the period $ 2.06
Options vested and expected to vest at end of the period $ 2.06