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Share-Based Compensation - Aggregated Information Regarding RSU and RSA Activity (Detail) - Restricted Stock Units And Restricted Stock Awards [Member]	9 Months Ended
	Oct. 31, 2020 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance, Outstanding Restricted Stock Units and Restricted Stock Awards | shares	134,634
Granted, Restricted Stock Units and Restricted Stock Awards | shares	245,131
Vested, Restricted Stock Units and Restricted Stock Awards | shares	(59,747)
Forfeited, Restricted Stock Units and Restricted Stock Awards | shares	(3,997)
Ending balance, Outstanding Restricted Stock Units and Restricted Stock Awards | shares	316,021
Beginning balance, Weighted Average Grant Date Fair Value | $ / shares	$ 16.79
Granted, Weighted Average Grant Date Fair Value | $ / shares	7.61
Vested, Weighted Average Grant Date Fair Value | $ / shares	17.58
Forfeited, Weighted Average Grant Date Fair Value | $ / shares	16.40
Ending balance, Weighted Average Grant Date Fair Value | $ / shares	$ 9.53

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

+ References

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-Publisher FASB
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-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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-Paragraph 2
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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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X

- Definition

Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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-Publisher FASB
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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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