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AdvisorEngine - Financial Interests carrying value of the Company's financial interests (Parenthetical) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019
Advisor Engine [Member] |  |
Variable interest entity, net of an impairment | $ 49,810 | $ 30,138

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- Definition Variable interest entity assets impairment, net. + References No definition available. + Details
Name: | wetf_VariableInterestEntityAssetsImpairmentNet
Namespace Prefix: | wetf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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