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v3.19.2

Deferred Consideration (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Contractual Gold Payments | $ 3,110 | $ 2,715 |  | $ 6,208 | $ 2,715 |
Contractual Gold Payments – gold ounces paid | 2,375 | 2,085 | [1] | 4,750 | 2,085 | [1]
(Loss)/gain on revaluation of deferred consideration – gold payments | $ (4,037) | $ 9,898 |  | $ 367 | $ 9,898 |
[1] | Represents payments during the period April 11, 2018 through June 30, 2018.

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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