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Share-Based Compensation - Summary of Options Outstanding (Detail) - $ / shares	6 Months Ended
	Jul. 31, 2021	Jan. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares outstanding, total	603,643	622,083
Outstanding, Weighted Average Exercise Price	$ 14.66
Exercisable, Weighted Average Exercise Price	$ 14.63
Outstanding Remaining Contractual Life	4 years 10 months 24 days
Number of shares exercisable, total	584,768
Exercisable Remaining Contractual Life	4 years 9 months 18 days
$5.00 - $10.00 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding Range of Exercise prices, Lower Limit	$ 5.00
Outstanding Range of Exercise prices, Upper Limit	$ 10.00
Outstanding, Number of shares	37,244
Outstanding, Weighted Average Exercise Price	$ 7.97
Exercisable, Weighted Average Exercise Price	$ 7.97
Outstanding Remaining Contractual Life	1 year
Exercisable, Number of shares	37,244
Exercisable Remaining Contractual Life	1 year
$10.01 - $15.00 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding Range of Exercise prices, Lower Limit	$ 10.01
Outstanding Range of Exercise prices, Upper Limit	$ 15.00
Outstanding, Number of shares	348,649
Outstanding, Weighted Average Exercise Price	$ 13.62
Exercisable, Weighted Average Exercise Price	$ 13.61
Outstanding Remaining Contractual Life	4 years 4 months 24 days
Exercisable, Number of shares	336,649
Exercisable Remaining Contractual Life	4 years 3 months 18 days
$15.01 - $20.00 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding Range of Exercise prices, Lower Limit	$ 15.01
Outstanding Range of Exercise prices, Upper Limit	$ 20.00
Outstanding, Number of shares	217,750
Outstanding, Weighted Average Exercise Price	$ 17.47
Exercisable, Weighted Average Exercise Price	$ 17.44
Outstanding Remaining Contractual Life	6 years 3 months 18 days
Exercisable, Number of shares	210,875
Exercisable Remaining Contractual Life	6 years 3 months 18 days

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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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Number of options outstanding, including both vested and non-vested 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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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

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