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Summary of status of options granted under stock option plans and changes in options outstanding (Detail) - USD ($)
 12 Months Ended
Oct. 31, 2017
Oct. 31, 2016
Shares    
Aggregate intrinsic value of options exercised during year $ 552,000  
Stock Option    
Shares    
Options outstanding at beginning of year 1,007,851 1,240,100
Options granted 449,068 104,936
Options exercised (36,763) (180,067)
Options forfeited (260,385) (157,118)
Options outstanding at end of year 1,159,771 1,007,851
Options exercisable at end of year 926,272 724,457
Options vested and expected to vest at end of year 1,159,002 1,002,522
Option price lower range $ 1.07 $ 2.30
Option price upper range $ 6.91 $ 6.91
Aggregate intrinsic value of options exercised during year $ 55,000 $ 456,000
Weighted Average Exercise Price    
Options outstanding at beginning of year $ 4.07 $ 3.64
Options granted 1.61 3.36
Options exercised 1.50 0.27
Options forfeited 4.10 4.53
Options outstanding at end of year 3.19 4.07
Options exercisable at end of year 3.08 3.93
Options vested and expected to vest at end of year $ 3.19 $ 4.07