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AdvisorEngine - Financial Interests carrying value of the Company's financial interests (Detail) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Total net carrying value | $ 8,500 | $ 36,284
Advisor Engine [Member] |  |
Unsecured convertible note, Amortized Cost plus Accrued Interest | 2,126 | 2,126
Unsecured non-convertible note, Amortized Cost, plus Accrued Interest | 31,184 | 31,184
Preferred stock, Amortized Cost, plus Accrued Interest | 25,000 | 25,000
Total amortized cost, plus accrued interest | 58,310 | 58,310
Total net carrying value | 8,500 | 28,172
Unsecured convertible note, Net Carrying Value |  | 2,126
Unsecured non-convertible note, Net Carrying Value | $ 8,500 | $ 26,046

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- Definition Carrying amount of the assets in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE), where the reporting entity is not the VIE's primary beneficiary. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph a -URI http://asc.fasb.org/extlink&oid=118582676&loc=d3e5728-111685 + Details
Name: | us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets
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 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 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: |