XML 70 R53.htm IDEA: XBRL DOCUMENT
v3.25.3

Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Fair Value, Recurring [Member] |  |  |
Assets: |  |  |
Cash equivalents |  | $ 199,576 | $ 48,336
Total |  | 303,859 | 134,462
Fair Value, Recurring [Member] | U.S. treasuries [Member] |  |  |
Assets: |  |  |
Financial instruments owned, at fair value |  | 5,510 | 5,251
Fair Value, Recurring [Member] | Equities [Member] |  |  |
Assets: |  |  |
Financial instruments owned, at fair value |  | 10,030 | 8,478
Fair Value, Recurring [Member] | Fixed income [Member] |  |  |
Assets: |  |  |
Financial instruments owned, at fair value |  | 2,676 | 1,905
Fair Value, Recurring [Member] | Level 1 [Member] |  |  |
Assets: |  |  |
Cash equivalents |  | 199,576 | 48,336
Total |  | 290,539 | 120,740
Fair Value, Recurring [Member] | Level 1 [Member] | U.S. treasuries [Member] |  |  |
Assets: |  |  |
Financial instruments owned, at fair value |  |  |
Fair Value, Recurring [Member] | Level 1 [Member] | Equities [Member] |  |  |
Assets: |  |  |
Financial instruments owned, at fair value |  | 10,030 | 8,478
Fair Value, Recurring [Member] | Level 1 [Member] | Fixed income [Member] |  |  |
Assets: |  |  |
Financial instruments owned, at fair value |  | 1,071 | 1,019
Fair Value, Recurring [Member] | Level 2 [Member] |  |  |
Assets: |  |  |
Cash equivalents |  |  |
Total |  | 13,320 | 13,035
Fair Value, Recurring [Member] | Level 2 [Member] | U.S. treasuries [Member] |  |  |
Assets: |  |  |
Financial instruments owned, at fair value |  | 5,510 | 5,251
Fair Value, Recurring [Member] | Level 2 [Member] | Equities [Member] |  |  |
Assets: |  |  |
Financial instruments owned, at fair value |  |  |
Fair Value, Recurring [Member] | Level 2 [Member] | Fixed income [Member] |  |  |
Assets: |  |  |
Financial instruments owned, at fair value |  | 1,605 | 886
Fair Value, Recurring [Member] | Level 3 [Member] |  |  |
Assets: |  |  |
Cash equivalents |  |  |
Total |  |  | 687
Fair Value, Recurring [Member] | Level 3 [Member] | U.S. treasuries [Member] |  |  |
Assets: |  |  |
Financial instruments owned, at fair value |  |  |
Fair Value, Recurring [Member] | Level 3 [Member] | Equities [Member] |  |  |
Assets: |  |  |
Financial instruments owned, at fair value |  |  |
Fair Value, Recurring [Member] | Level 3 [Member] | Fixed income [Member] |  |  |
Assets: |  |  |
Financial instruments owned, at fair value |  |  |
Fair Value, Recurring [Member] | ETFs [Member] |  |  |
Assets: |  |  |
Financial instruments owned, at fair value |  | 79,862 |
Fair Value, Recurring [Member] | ETFs [Member] | Level 1 [Member] |  |  |
Assets: |  |  |
Financial instruments owned, at fair value |  | 79,862 |
Fair Value, Recurring [Member] | ETFs [Member] | Level 2 [Member] |  |  |
Assets: |  |  |
Financial instruments owned, at fair value |  |  |
Fair Value, Recurring [Member] | ETFs [Member] | Level 3 [Member] |  |  |
Assets: |  |  |
Financial instruments owned, at fair value |  |  |
Fair Value, Recurring [Member] | Pass-through GSEs [Member] |  |  |
Assets: |  |  |
Financial instruments owned, at fair value |  | 6,205 | 6,898
Fair Value, Recurring [Member] | Pass-through GSEs [Member] | Level 1 [Member] |  |  |
Assets: |  |  |
Financial instruments owned, at fair value |  |  |
Fair Value, Recurring [Member] | Pass-through GSEs [Member] | Level 2 [Member] |  |  |
Assets: |  |  |
Financial instruments owned, at fair value |  | 6,205 | 6,898
Fair Value, Recurring [Member] | Pass-through GSEs [Member] | Level 3 [Member] |  |  |
Assets: |  |  |
Financial instruments owned, at fair value |  |  |
Fair Value, Recurring [Member] | ETFs [Member] |  |  |
Assets: |  |  |
Financial instruments owned, at fair value |  |  | 62,907
Fair Value, Recurring [Member] | ETFs [Member] | Level 1 [Member] |  |  |
Assets: |  |  |
Financial instruments owned, at fair value |  |  | 62,907
Fair Value, Recurring [Member] | ETFs [Member] | Level 2 [Member] |  |  |
Assets: |  |  |
Financial instruments owned, at fair value |  |  |
Fair Value, Recurring [Member] | ETFs [Member] | Level 3 [Member] |  |  |
Assets: |  |  |
Financial instruments owned, at fair value |  |  |
Fnality International Limited—Series B-1 Preference Shares [Member] | Fair Value, Recurring [Member] |  |  |
Assets: |  |  |
Non-recurring fair value measurements | [1] | 8,035 |
Fnality International Limited—Series B-1 Preference Shares [Member] | Fair Value, Recurring [Member] | Level 1 [Member] |  |  |
Assets: |  |  |
Non-recurring fair value measurements | [1] |  |
Fnality International Limited—Series B-1 Preference Shares [Member] | Fair Value, Recurring [Member] | Level 2 [Member] |  |  |
Assets: |  |  |
Non-recurring fair value measurements | [1] |  |
Fnality International Limited—Series B-1 Preference Shares [Member] | Fair Value, Recurring [Member] | Level 3 [Member] |  |  |
Assets: |  |  |
Non-recurring fair value measurements | [1] | $ 8,035 |
Fnality International Limited—Series B-1 Preference Shares [Member] | Fair Value, Nonrecurring [Member] |  |  |
Assets: |  |  |
Non-recurring fair value measurements | [2] |  | 8,288
Fnality International Limited—Series B-1 Preference Shares [Member] | Fair Value, Nonrecurring [Member] | Level 1 [Member] |  |  |
Assets: |  |  |
Non-recurring fair value measurements | [2] |  |
Fnality International Limited—Series B-1 Preference Shares [Member] | Fair Value, Nonrecurring [Member] | Level 2 [Member] |  |  |
Assets: |  |  |
Non-recurring fair value measurements | [2] |  |
Fnality International Limited—Series B-1 Preference Shares [Member] | Fair Value, Nonrecurring [Member] | Level 3 [Member] |  |  |
Assets: |  |  |
Non-recurring fair value measurements | [2] |  | 8,288
Other Investments [Member] | Fair Value, Recurring [Member] |  |  |
Assets: |  |  |
Financial instruments owned, at fair value |  |  | 687
Other Investments [Member] | Fair Value, Recurring [Member] | Level 1 [Member] |  |  |
Assets: |  |  |
Financial instruments owned, at fair value |  |  |
Other Investments [Member] | Fair Value, Recurring [Member] | Level 2 [Member] |  |  |
Assets: |  |  |
Financial instruments owned, at fair value |  |  |
Other Investments [Member] | Fair Value, Recurring [Member] | Level 3 [Member] |  |  |
Assets: |  |  |
Financial instruments owned, at fair value |  |  | $ 687
[1] | Fair value determined on September 10, 2025. Not included in the table above are prospective changes in value due to fluctuations in the British pound to U.S. dollar exchange rate.
[2] | Fair value determined on June 17, 2024. Not included in the table above are prospective changes in value due to fluctuations in the British pound to U.S. dollar exchange rate.

X
- References No definition available. + Details
Name: | us-gaap_AssetsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value portion of asset recognized for present right to economic benefit. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_AssetsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-10 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_CashAndCashEquivalentsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of investment in equity method investee and investment in and advance to affiliate. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(18)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value of financial instruments held by a broker-dealer for their own account (proprietary securities) for trading or investment purposes determined by management based upon quoted prices of a financial instrument with similar characteristics or on a valuation technique or model. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 940 -SubTopic 320 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479035/940-320-45-2 + Details
Name: | us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_USTreasurySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_EquitySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_FixedIncomeInvestmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis=us-gaap_ExchangeTradedOptionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis=wt_PassthroughGSEsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis=us-gaap_ExchangeTradedFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=wt_FnalityInternationalLimitedBOnePreferenceSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsNonrecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_OtherInvestmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |