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v3.21.1

Deferred Consideration - Schedule of Deferred Consideration (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Contractual gold payments | $ 4,270 | $ 3,760
Contractual gold payments – gold ounces paid | 2,375 | 2,375
Gain/(loss) on revaluation of deferred consideration - gold payments | $ 2,832 | $ (2,208)

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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

X
- 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

X
- 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