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AdvisorEngine - Financial Interests - Additional Information (Detail) - Advisor Engine [Member] $ in Thousands | Sep. 30, 2020 USD ($)
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Maximum Amount of Contingent Payments That May be Received | $ 10,408
Upfront consideration paid to the Company | $ 9,592

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- Definition Maximum amount of contingent payments that may be received. + References No definition available. + Details
Name: | wetf_MaximumAmountOfContingentPaymentsThatMayBeReceived
Namespace Prefix: | wetf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Upfront consideration paid to the company. + References No definition available. + Details
Name: | wetf_MaximumConsiderationPayableAtFutureDate
Namespace Prefix: | wetf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=wetf_AdvisorEngineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |