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v3.20.1

Leases - Additional Information (Detail) - USD ($) $ in Thousands |  | 3 Months Ended
--- | --- | ---
Aug. 21, 2024 | Mar. 31, 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: |