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Stock-based compensation and equity transactions - Summary of status of options granted under stock option plans and changes in options outstanding (Detail) - Stock Option
 6 Months Ended
Apr. 30, 2018
$ / shares
shares
Shares  
Options Outstanding at November 1, 2017 | shares 1,159,771
Options granted | shares 269,635
Options canceled or expired | shares (334,345)
Options outstanding at April 30, 2018 | shares 1,095,061
Options exercisable at April 30, 2018 | shares 706,247
Options vested and expected to vest at April 30, 2018 | shares 1,092,538
Weighted Average Exercise Price  
Options Outstanding at November 1, 2017 | $ / shares $ 3.19
Options granted | $ / shares 2.44
Options canceled or expired | $ / shares 4.86
Options outstanding at April 30, 2018 | $ / shares 3.32
Options exercisable at April 30, 2018 | $ / shares 3.47
Options vested and expected to vest at April 30, 2018 | $ / shares $ 3.32