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Stock options - Summary of status of options granted under stock option plans and changes in options outstanding (Detail) - USD ($)	12 Months Ended
	Oct. 31, 2019	Oct. 31, 2018
Shares
Option price lower range	$ 1.90	$ 1.90
Option price upper range	$ 8.69	$ 5.88
Stock Option
Shares
Outstanding at beginning of year	942,366	1,159,771
Options granted	124,097	269,635
Options exercised	(171,066)	(418,955)
Options canceled or expired	(5,250)	(68,085)
Options outstanding at end of year	890,147	942,366
Options exercisable at January 31, 2019	599,981	675,033
Options vested and expected to vest at end of year	889,088	940,144
Aggregate intrinsic value of options exercised during year	$ 317,827	$ 1,207,148
Weighted Average Exercise Price
Outstanding at beginning of year	$ 3.09	$ 3.19
Options granted	8.16	2.44
Options exercised	3.86	2.66
Options canceled or expired	6.82	4.98
Options outstanding at end of year	3.62	3.09
Options exercisable at end of year	3.25	3.01
Options vested and expected to vest at end of year	$ 3.63	$ 3.09

X

- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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Net number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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Number of share options (or share units) exercised during the current period.

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