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AdvisorEngine - Financial Interests - Additional Information (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($)
Impairment of financial interest | $ (30,138)
Advisor Engine [Member] |
Impairment of financial interest | $ 30,138

X
- Definition Impairment of AdvisorEngine financial interests + References No definition available. + Details
Name: | wetf_VariableInterestEntityNonconsolidatedCarryingAmountAssetsImpairment
Namespace Prefix: | wetf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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