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AdvisorEngine - Financial Interests carrying value of the Company's financial interests (Detail) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Total net carrying value |  | $ 28,172
Advisor Engine [Member] |  |
Unsecured convertible note, Amortized Cost plus Accrued Interest |  | 2,126
Unsecured non-convertible note, Amortized Cost, plus Accrued Interest |  | 31,184
Subtotal - notes receivable: Amortized Cost, plus Accured Interest |  | 33,310
Preferred stock, Amortized Cost, plus Accrued Interest |  | 25,000
Total amortized cost, plus accrued interest |  | 58,310
Unsecured convertible note, Net Carrying Value |  | 2,126
Unsecured non-convertible note, Net Carrying Value |  | 26,046
Subtotal - Notes receivable:, Net Carrying Value |  | 28,172
Preferred stock, Net Carrying Value |  |
Total net carrying value |  | $ 28,172

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- Definition Amount, after allowance for credit loss, of financing receivable, classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Nonconsolidated, carrying amount, note receivable - Convertible. + References No definition available. + Details
Name: | wetf_VariableInterestEntityNonConsolidatedCarryingAmountNoteReceivableConvertible
Namespace Prefix: | wetf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Nonconsolidated, carrying amount, preferred stock. + References No definition available. + Details
Name: | wetf_VariableInterestEntityNonConsolidatedCarryingAmountPreferredStock
Namespace Prefix: | wetf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Variable interest entity non consolidated subtotal notes receivable carrying value. + References No definition available. + Details
Name: | wetf_VariableInterestEntityNonConsolidatedSubtotalNotesReceivableCarryingValue
Namespace Prefix: | wetf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Nonconsolidated Carrying Amount PreferredStock Gross Carrying Value. + References No definition available. + Details
Name: | wetf_VariableInterestEntityNonconsolidatedCarryingAmountPreferredstockGrossCarryingValue
Namespace Prefix: | wetf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Variable interest entity nonconsolidated gross carrying amount assets. + References No definition available. + Details
Name: | wetf_VariableInterestEntityNonconsolidatedGrossCarryingAmountAssets
Namespace Prefix: | wetf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Variable interest entity nonconsolidated notes receivable carrying value. + References No definition available. + Details
Name: | wetf_VariableInterestEntityNonconsolidatedNotesReceivableCarryingValue
Namespace Prefix: | wetf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Nonconsolidated Unsecured Convertible Notes Carrying Value. + References No definition available. + Details
Name: | wetf_VariableInterestEntityNonconsolidatedUnsecuredConvertibleNotesCarryingValue
Namespace Prefix: | wetf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Nonconsolidated Unsecured Non Convertible Notes Carrying Value. + References No definition available. + Details
Name: | wetf_VariableInterestEntityNonconsolidatedUnsecuredNonConvertibleNotesCarryingValue
Namespace Prefix: | wetf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Nonconsolidated, carrying amount, note receivable - unsecured. + References No definition available. + Details
Name: | wetf_VariableinterestEntityNonConsolidatedCarryingAmountNoteReceivableUnsecured
Namespace Prefix: | wetf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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