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Credit Facility - Summary of Outstanding Borrowings under Credit Facility (Parenthetical) (Detail) - USD ($) $ in Thousands | Jun. 16, 2020 | Mar. 31, 2020
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Term Loan and Revolving Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Amount repaid | $ 174,000 | $ 5,000

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Repayments of outstanding borrowings under credit facility + References No definition available. + Details
Name: | wetf_RepaymentsOfOutstandingBorrowingsUnderCreditFacility
Namespace Prefix: | wetf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_CreditFacilityAxis=wetf_TermLoanAndRevolvingCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |