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Deferred Consideration (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Contractual Gold Payments |  |  |  |  |  |  |  |  | $ 13,226 |  | $ 8,512 |
Contractual Gold Payments – gold ounces paid |  |  |  |  |  |  |  |  | 9,500 |  | 6,835 | [1]
(Loss)/gain on revaluation of deferred consideration – gold payments | $ (5,354) | $ (6,306) | $ (4,037) | $ 4,404 | $ (5,410) | $ 7,732 | $ 9,898 | $ 12,220 | $ (11,293) | [2] | $ 12,220 | [2]
[1] | Represents payments during the period April 11, 2018 through December 31, 2018.
[2] | (Losses)/gains arise due to increases/(decreases) in the forward-looking price of gold and the magnitude of any gain or loss is highly correlated to the magnitude of the change in the forward-looking price of gold. See Note 5 for a reconciliation of changes in the deferred consideration balances

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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