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Variable Interest Entity - Summary of Information about Variable Interests (Detail) - USD ($) | Sep. 30, 2019 | Dec. 31, 2018
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Carrying Amount - Assets |  |
Preferred stock | $ 25,000,000 | $ 25,000,000
Unsecured non-convertible note receivable | 30,556,000 | 28,722,000
Unsecured convertible note receivable | 1,812,000 |
Total carrying amount - Assets | 57,368,000 | 53,722,000
Maximum exposure to loss | $ 57,368,000 | $ 53,722,000

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- Definition The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118582676&loc=d3e5747-111685 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph b -URI http://asc.fasb.org/extlink&oid=118582676&loc=d3e5728-111685 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | instant

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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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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Data Type: | xbrli:stringItemType
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- Definition Variable interest entity, nonconsolidated, carrying amount, note receivable - Convertible. + References No definition available. + Details
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Namespace Prefix: | wetf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Variable interest entity, nonconsolidated, carrying amount, note receivable - unsecured. + References No definition available. + Details
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Namespace Prefix: | wetf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Variable interest entity, nonconsolidated, carrying amount, preferred stock. + References No definition available. + Details
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Namespace Prefix: | wetf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant