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Commitments and Contingencies - Additional Information (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jul. 31, 2020	Jan. 31, 2020
Commitments And Contingencies Disclosure [Abstract]
Non-cancelable purchase commitments	$ 4,000,000.0	$ 4,000,000.0
Accrued liabilities for loss contingencies	0
Cumulative charges of litigation loss	$ 0	$ 600,000

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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- Definition

Amount of loss contingency liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
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- Definition

The amount of loss pertaining to the specified contingency that was charged against earnings in the period, including the effects of revisions in previously reported estimates.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

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- Definition

Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier.

+ References

No definition available.

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	instant