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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	9 Months Ended
	Jul. 31, 2018 $ / shares shares
Shares
Outstanding at November 1, 2017 | shares	1,159,771
Options granted | shares	269,635
Options exercised | shares	(396,087)
Options canceled or expired | shares	(63,718)
Options outstanding at July 31, 2018 | shares	969,601
Options exercisable at July 31, 2018 | shares	654,863
Options vested and expected to vest at July 31, 2018 | shares	967,379
Weighted Average Exercise Price
Outstanding at November 1, 2017 | $ / shares	$ 3.20
Options granted | $ / shares	2.44
Options exercised | $ / shares	2.57
Options canceled or expired | $ / shares	4.88
Options outstanding at July 31, 2018 | $ / shares	3.11
Options exercisable at July 31, 2018 | $ / shares	3.09
Options vested and expected to vest at July 31, 2018 | $ / shares	$ 3.11

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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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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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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