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Summary of status of options granted under stock option plans and changes in options outstanding (Detail) - Stock Option
 3 Months Ended
Jan. 31, 2017
$ / shares
shares
Shares  
Options Outstanding at beginning of year | shares 1,007,851
Options granted | shares 309,356
Options canceled or expired | shares (143,019)
Options outstanding at end of year | shares 1,174,188
Options exercisable at end of year | shares 738,444
Options vested and expected to vest at end of year | shares 1,172,141
Weighted Average Exercise Price  
Options outstanding at beginning of year | $ / shares $ 4.07
Options granted | $ / shares 1.50
Options canceled or expired | $ / shares 3.77
Options outstanding at end of year | $ / shares 3.43
Options exercisable at end of year | $ / shares 3.71
Options vested and expected to vest at end of year | $ / shares $ 3.43