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Leases - Additional Information (Detail) - USD ($) $ in Thousands		6 Months Ended
	Aug. 21, 2024	Jun. 30, 2020
Operating lease notice to landlord before cancellation		12 months
Scenario, Forecast [Member]
Operating lease cancellation cost	$ 4,236

X

- Definition

Amount of Operating Lease Cancellation Cost.

+ References

No definition available.

+ Details

Name:	wetf_OperatingLeaseCancellationCost
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

Name:	wetf_OperatingLeaseNoticeToLandlordBeforeCancellation
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: