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Leases - Additional Information (Detail) - USD ($) $ in Thousands			6 Months Ended
	Aug. 21, 2024	Aug. 21, 2023	Jun. 30, 2021
Operating lease notice to landlord before cancellation		12 months
Operating lease, impairment loss			$ 303
Scenario, Forecast [Member]
Operating lease cancellation cost	$ 4,236

X

- Definition

Amount of loss from impairment of right-of-use asset from operating lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 25
-Paragraph 6
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121593497&loc=SL77918431-209957

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of Operating Lease Cancellation Cost.

+ References

No definition available.

+ Details

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Namespace Prefix:	wetf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Operating Lease Notice to Landlord Before Cancellation.

+ References

No definition available.

+ Details

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Namespace Prefix:	wetf_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: