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: