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v3.20.4

Deferred Consideration - Schedule of Deferred Consideration (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Contractual gold payments |  |  |  |  |  |  |  |  | $ 16,811 | $ 13,226 | $ 8,512
Contractual gold payments – gold ounces paid |  |  |  |  |  |  |  |  | 9,500 | 9,500 |
Loss on revaluation of deferred consideration – gold payments | $ (22,385) | $ (8,870) | $ (23,358) | $ (2,208) | $ (5,354) | $ (6,306) | $ (4,037) | $ 4,404 | $ (56,821) | $ (11,293) | $ 12,220

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- Definition Contractual gold payments. + References No definition available. + Details
Name: | wetf_ContractualGoldPayments
Namespace Prefix: | wetf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents Contractual Gold Payments Gold Ounces Paid. + References No definition available. + Details
Name: | wetf_ContractualGoldPaymentsGoldOuncesPaid
Namespace Prefix: | wetf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Gain/loss from revaluation of deferred consideration. + References No definition available. + Details
Name: | wetf_GainLossFromChangeInDeferredConsideration
Namespace Prefix: | wetf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration