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Share-Based Compensation - Summary of Options Outstanding (Detail) - $ / shares	9 Months Ended
	Oct. 31, 2020	Jan. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares outstanding, total	622,583	679,044
Outstanding, Weighted Average Exercise Price	$ 14.62
Exercisable, Weighted Average Exercise Price	$ 14.34
Outstanding Remaining Contractual Life	5 years 7 months 6 days
Number of shares exercisable, total	523,052
Exercisable Remaining Contractual Life	5 years 3 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	41,444
Outstanding, Weighted Average Exercise Price	$ 7.97
Exercisable, Weighted Average Exercise Price	$ 7.97
Outstanding Remaining Contractual Life	1 year 7 months 6 days
Exercisable, Number of shares	41,444
Exercisable Remaining Contractual Life	1 year 7 months 6 days
$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	359,414
Outstanding, Weighted Average Exercise Price	$ 13.63
Exercisable, Weighted Average Exercise Price	$ 13.65
Outstanding Remaining Contractual Life	5 years 1 month 6 days
Exercisable, Number of shares	314,241
Exercisable Remaining Contractual Life	4 years 10 months 24 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	221,725
Outstanding, Weighted Average Exercise Price	$ 17.48
Exercisable, Weighted Average Exercise Price	$ 17.22
Outstanding Remaining Contractual Life	7 years 1 month 6 days
Exercisable, Number of shares	167,367
Exercisable Remaining Contractual Life	7 years

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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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