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Deferred Consideration - Summary of valuation of deferred consideration (Detail) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
Disclosure Of Valuation Of Deferred Consideration [Line Item] |  |
Discount rate | 10.00% | 10.00%
Perpetual growth rate | 0.90% | 1.50%
Minimum [Member] |  |
Disclosure Of Valuation Of Deferred Consideration [Line Item] |  |
Forward-looking gold price | $ 1,889 | $ 1,535
Maximum [Member] |  |
Disclosure Of Valuation Of Deferred Consideration [Line Item] |  |
Forward-looking gold price | 2,678 | 2,328
Weighted Average [Member] |  |
Disclosure Of Valuation Of Deferred Consideration [Line Item] |  |
Forward-looking gold price | $ 2,104 | $ 1,757

X
- Definition Discount rate used to value the deferred consideration. + References No definition available. + Details
Name: | wetf_BusinessCombinationConsiderationTransferredDeferredPaymentInterest
Namespace Prefix: | wetf_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Rate at which represents the deferred consideration perpetual growth. + References No definition available. + Details
Name: | wetf_DeferredConsiderationPerpetualGrowthRate
Namespace Prefix: | wetf_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Disclosure Of Valuation Of Deferred Consideration. + References No definition available. + Details
Name: | wetf_DisclosureOfValuationOfDeferredConsiderationLineItems
Namespace Prefix: | wetf_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Forward-looking gold price. + References No definition available. + Details
Name: | wetf_ForwardLookingGoldPrice
Namespace Prefix: | wetf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_WeightedAverageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |