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Summary of status of options granted under stock option plans and changes in options outstanding (Detail) - Stock Option
 6 Months Ended
Apr. 30, 2017
$ / shares
shares
Shares  
Options Outstanding at November 1, 2016 | shares 1,007,851
Options granted | shares 309,356
Options canceled or expired | shares (163,353)
Options outstanding at April 30, 2017 | shares 1,153,854
Options exercisable at April 30, 2017 | shares 807,735
Options vested and expected to vest at April 30, 2017 | shares 1,151,823
Weighted Average Exercise Price  
Options Outstanding at November 1, 2016 | $ / shares $ 4.07
Options granted | $ / shares 1.5
Options canceled or expired | $ / shares 3.8
Options outstanding at April 30, 2017 | $ / shares 3.42
Options exercisable at April 30, 2017 | $ / shares 3.52
Options vested and expected to vest at April 30, 2017 | $ / shares $ 3.42