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Convertible Notes - Additional Information (Detail) $ / shares in Units, $ in Thousands					3 Months Ended		6 Months Ended
	Feb. 14, 2023 USD ($) Day $ / shares shares	Jun. 14, 2021 USD ($) Day $ / shares shares	Aug. 13, 2020 USD ($) Day $ / shares	Jun. 16, 2020 USD ($) Day $ / shares	Jun. 30, 2023 USD ($) shares	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) shares	Jun. 30, 2022 USD ($)	Jun. 15, 2023 USD ($) shares	Dec. 31, 2022 USD ($) shares
Convertible Senior Notes [Line Items]
Convertible senior notes face value					$ 280,000		$ 280,000			$ 325,000
Loss on extinguishment of debt (Note 11)					$ 0	$ 0	$ (9,721)	$ 0
Common stock, shares issued | shares					150,343,000		150,343,000			146,517,000
Accounts Payable and Accrued Liabilities [Member]
Convertible Senior Notes [Line Items]
Interest payable					$ 3,061		$ 3,061			$ 621
Convertible Senior Notes Due Two Thousand And Twenty Three [Member]
Convertible Senior Notes [Line Items]
Interest expense					4,021	$ 3,733	8,023	$ 7,465
Convertible senior notes face value			$ 25,000	$ 150,000	280,000		280,000
Convertible senior notes stated rate of interest			4.25%	4.25%
Covertible senior notes year of maturity			2023	2023
Redemption provisions - Convertible notes, threshold consecutive trading days | Day	30	30	30	30
Minimum percentage of lenders required to have entire principal amount of convertible notes repurchased by the Company upon certain events of default				25.00%
Convertible Senior Notes Due Two Thousand And Twenty Three [Member] | Fair Value, Inputs, Level 2 [Member]
Convertible Senior Notes [Line Items]
Fair Value Of Convertible Notes					$ 280,671		$ 280,671			320,513
Convertible Senior Notes [Member]
Convertible Senior Notes [Line Items]
Convertible senior notes face value									$ 60,000
Convertible senior notes stated rate of interest									4.25%
Convertible debt instrument terms of interest payment							●   Interest rate: Payable semiannually in arrears on February 15 and August 15 of each year for the 2023 Notes (beginning on August 15, 2023) and on June 15 and December 15 of each year for the 2021 Notes.
Convertible debt instrument conversion price | $ / shares	$ 1,000	$ 1,000	$ 1,000	$ 1,000
Convertible debt instrument terms of conversion	●   Conversion: Holders may convert at their option at any time prior to the close of business on the business day immediately preceding May 15, 2028 and March 15, 2026 for the 2023 Notes and 2021 Notes, respectively, only under the following circumstances: (i) if the last reported sale price of the Company’s common stock for at least 20 trading days during a period of 30 consecutive trading days ending on the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price for the respective Convertible Notes on each applicable trading day; (ii) during the five business day period after any ten consecutive trading day period (the “measurement period”) in which the trading price per $1,000 principal amount of the Convertible Notes for each trading day of the measurement period was less than 98% of the product of the last reported sales price of the Company’s common stock and the conversion rate on each such trading day; (iii) upon a notice of redemption delivered by the Company in accordance with the terms of the indentures but only with respect to the Convertible Notes called (or deemed called) for redemption; or (iv) upon the occurrence of specified corporate events. On or after May 15, 2028 and March 15, 2026 in respect of the 2023 Notes and the 2021 Notes, respectively, until the close of business on the second scheduled trading day immediately preceding the maturity date, holders may convert their Convertible Notes at any time, regardless of the foregoing circumstances.	●   Conversion: Holders may convert at their option at any time prior to the close of business on the business day immediately preceding May 15, 2028 and March 15, 2026 for the 2023 Notes and 2021 Notes, respectively, only under the following circumstances: (i) if the last reported sale price of the Company’s common stock for at least 20 trading days during a period of 30 consecutive trading days ending on the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price for the respective Convertible Notes on each applicable trading day; (ii) during the five business day period after any ten consecutive trading day period (the “measurement period”) in which the trading price per $1,000 principal amount of the Convertible Notes for each trading day of the measurement period was less than 98% of the product of the last reported sales price of the Company’s common stock and the conversion rate on each such trading day; (iii) upon a notice of redemption delivered by the Company in accordance with the terms of the indentures but only with respect to the Convertible Notes called (or deemed called) for redemption; or (iv) upon the occurrence of specified corporate events. On or after May 15, 2028 and March 15, 2026 in respect of the 2023 Notes and the 2021 Notes, respectively, until the close of business on the second scheduled trading day immediately preceding the maturity date, holders may convert their Convertible Notes at any time, regardless of the foregoing circumstances.	●   Conversion: Holders may convert at their option at any time prior to the close of business on the business day immediately preceding May 15, 2028 and March 15, 2026 for the 2023 Notes and 2021 Notes, respectively, only under the following circumstances: (i) if the last reported sale price of the Company’s common stock for at least 20 trading days during a period of 30 consecutive trading days ending on the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price for the respective Convertible Notes on each applicable trading day; (ii) during the five business day period after any ten consecutive trading day period (the “measurement period”) in which the trading price per $1,000 principal amount of the Convertible Notes for each trading day of the measurement period was less than 98% of the product of the last reported sales price of the Company’s common stock and the conversion rate on each such trading day; (iii) upon a notice of redemption delivered by the Company in accordance with the terms of the indentures but only with respect to the Convertible Notes called (or deemed called) for redemption; or (iv) upon the occurrence of specified corporate events. On or after May 15, 2028 and March 15, 2026 in respect of the 2023 Notes and the 2021 Notes, respectively, until the close of business on the second scheduled trading day immediately preceding the maturity date, holders may convert their Convertible Notes at any time, regardless of the foregoing circumstances.	●   Conversion: Holders may convert at their option at any time prior to the close of business on the business day immediately preceding May 15, 2028 and March 15, 2026 for the 2023 Notes and 2021 Notes, respectively, only under the following circumstances: (i) if the last reported sale price of the Company’s common stock for at least 20 trading days during a period of 30 consecutive trading days ending on the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price for the respective Convertible Notes on each applicable trading day; (ii) during the five business day period after any ten consecutive trading day period (the “measurement period”) in which the trading price per $1,000 principal amount of the Convertible Notes for each trading day of the measurement period was less than 98% of the product of the last reported sales price of the Company’s common stock and the conversion rate on each such trading day; (iii) upon a notice of redemption delivered by the Company in accordance with the terms of the indentures but only with respect to the Convertible Notes called (or deemed called) for redemption; or (iv) upon the occurrence of specified corporate events. On or after May 15, 2028 and March 15, 2026 in respect of the 2023 Notes and the 2021 Notes, respectively, until the close of business on the second scheduled trading day immediately preceding the maturity date, holders may convert their Convertible Notes at any time, regardless of the foregoing circumstances.
Redemption provisions - Convertible notes	●   Redemption price: The Company may redeem for cash all or any portion of the Convertible Notes, at its option, on or after August 20, 2025 and June 20, 2023 in respect of the 2023 Notes and the 2021 Notes, respectively, and on or prior to the 55th scheduled trading day immediately preceding the maturity date, if the last reported sale price of the Company’s common stock has been at least 130% of the conversion price for the respective Convertible Notes then in effect for at least 20 trading days, including the trading day immediately preceding the date on which the Company provides notice of redemption, during any 30 consecutive trading day period ending on, and including, the trading day immediately preceding the date on which the Company provides notice of redemption, at a redemption price equal to 100% of the principal amount of the notes to be redeemed, plus accrued and unpaid interest to, but excluding the redemption date. No sinking fund is provided for the Convertible Notes.	●   Redemption price: The Company may redeem for cash all or any portion of the Convertible Notes, at its option, on or after August 20, 2025 and June 20, 2023 in respect of the 2023 Notes and the 2021 Notes, respectively, and on or prior to the 55th scheduled trading day immediately preceding the maturity date, if the last reported sale price of the Company’s common stock has been at least 130% of the conversion price for the respective Convertible Notes then in effect for at least 20 trading days, including the trading day immediately preceding the date on which the Company provides notice of redemption, during any 30 consecutive trading day period ending on, and including, the trading day immediately preceding the date on which the Company provides notice of redemption, at a redemption price equal to 100% of the principal amount of the notes to be redeemed, plus accrued and unpaid interest to, but excluding the redemption date. No sinking fund is provided for the Convertible Notes.	●   Redemption price: The Company may redeem for cash all or any portion of the Convertible Notes, at its option, on or after August 20, 2025 and June 20, 2023 in respect of the 2023 Notes and the 2021 Notes, respectively, and on or prior to the 55th scheduled trading day immediately preceding the maturity date, if the last reported sale price of the Company’s common stock has been at least 130% of the conversion price for the respective Convertible Notes then in effect for at least 20 trading days, including the trading day immediately preceding the date on which the Company provides notice of redemption, during any 30 consecutive trading day period ending on, and including, the trading day immediately preceding the date on which the Company provides notice of redemption, at a redemption price equal to 100% of the principal amount of the notes to be redeemed, plus accrued and unpaid interest to, but excluding the redemption date. No sinking fund is provided for the Convertible Notes.	●   Redemption price: The Company may redeem for cash all or any portion of the Convertible Notes, at its option, on or after August 20, 2025 and June 20, 2023 in respect of the 2023 Notes and the 2021 Notes, respectively, and on or prior to the 55th scheduled trading day immediately preceding the maturity date, if the last reported sale price of the Company’s common stock has been at least 130% of the conversion price for the respective Convertible Notes then in effect for at least 20 trading days, including the trading day immediately preceding the date on which the Company provides notice of redemption, during any 30 consecutive trading day period ending on, and including, the trading day immediately preceding the date on which the Company provides notice of redemption, at a redemption price equal to 100% of the principal amount of the notes to be redeemed, plus accrued and unpaid interest to, but excluding the redemption date. No sinking fund is provided for the Convertible Notes.
Redemption provisions - Convertible notes, threshold trading days | Day	20	20	20	20
Redemption provisions - Convertible notes, threshold consecutive trading days | Day	30	30	30	30
Redemption provisions - Convertible notes redemption price as a percentage of principal amount accrued interest and unpaid interest	100.00%	100.00%	100.00%	100.00%
Maximum number of shares issuable upon conversion | shares	43,551,214	43,551,214
Number Of Threshold Trading Days For Determining The Share Price	5 days	5 days	5 days	5 days
Measurement period for determining share price	10 days	10 days	10 days	10 days
Share price as a percentage of last reported price and conversion rate	98.00%	98.00%	98.00%	98.00%
Convertible note per lot	1,000	1,000	1,000	1,000
Sale price as a percentage of conversion price	130.00%	130.00%	130.00%	130.00%
Common stock, shares issued | shares									1,037
Convertible Senior Notes Due Two Thousand And Twenty Six [Member]
Convertible Senior Notes [Line Items]
Convertible senior notes face value	$ 130,000	$ 150,000
Convertible senior notes stated rate of interest	5.75%	3.25%
Covertible senior notes year of maturity	2028	2026
Maximum Conversion Rate	167.7853	144.9275
Two Thousand And Twenty Notes [Member]
Convertible Senior Notes [Line Items]
Convertible senior notes face value	$ 115,000									$ 175,000
Loss on extinguishment of debt (Note 11)							$ 9,721
Cash									$ 59,955
Common stock, shares issued | shares									1,037,288

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Convertible senior notes year of maturity.

+ References

No definition available.

+ Details

Name:	wt_ConvertibleSeniorNotesYearOfMaturity
Namespace Prefix:	wt_
Data Type:	xbrli:gYearItemType
Balance Type:	na
Period Type:	duration

X

- Definition

FairValueOfConvertibleNotes.

+ References

No definition available.

+ Details

Name:	wt_Fairvalueofconvertiblenotes
Namespace Prefix:	wt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Interest expense on convertible notes.

+ References

No definition available.

+ Details

Name:	wt_InterestExpenseOnConvertibleNotes
Namespace Prefix:	wt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Maximum conversion rate.

+ References

No definition available.

+ Details

Name:	wt_MaximumConversionRate
Namespace Prefix:	wt_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Maximum number of shares issuable upon conversion.

+ References

No definition available.

+ Details

Name:	wt_MaximumNumberOfSharesIssuableUponConversion
Namespace Prefix:	wt_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Measurement period for determining share price

+ References

No definition available.

+ Details

Name:	wt_MeasurementPeriodForDeterminingSharePrice
Namespace Prefix:	wt_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

MinimumPercentageOfLendersRequiredToHaveEntirePrincipalAmountOfConvertibleNotesRepurchasedByTheCompanyUponCertainEventsOfDefault.

+ References

No definition available.

+ Details

Name:	wt_Minimumpercentageoflendersrequiredtohaveentireprincipalamountofconvertiblenotesrepurchasedbythecompanyuponcertaineventsofdefault
Namespace Prefix:	wt_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number Of Threshold Trading Days For Determining The Share Price

+ References

No definition available.

+ Details

Name:	wt_NumberOfThresholdTradingDaysForDeterminingTheSharePrice
Namespace Prefix:	wt_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Sale price as a percentage of conversion price.

+ References

No definition available.

+ Details

Name:	wt_SalePriceAsAPercentageOfConversionPrice
Namespace Prefix:	wt_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Share price as a percentage of last reported price and conversion rate

+ References

No definition available.

+ Details

Name:	wt_SharePriceAsAPercentageOfLastReportedPriceAndConversionRate
Namespace Prefix:	wt_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_BalanceSheetLocationAxis=us-gaap_AccountsPayableAndAccruedLiabilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=wt_ConvertibleSeniorNotesDueTwoThousandAndTwentyThreeMember
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_LongtermDebtTypeAxis=wt_ConvertibleSeniorNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=wt_ConvertibleSeniorNotesDueTwoThousandAndTwentySixMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=wt_TwoThousandAndTwentyNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: