XML 147 R68.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Business Combination - Summary of Fair Value of Intangible Assets (Parenthetical) (Detail) - Acquisition of ETFS Business [Member] | Nov. 30, 2019 | Apr. 11, 2018
--- | --- | ---
Business Acquisition [Line Items] |  |
Weighted average cost of capital percentage | 10.00% | 11.60%
Minimum [Member] |  |
Business Acquisition [Line Items] |  |
Revenue growth percentage | 3.00% | 3.00%
Maximum [Member] |  |
Business Acquisition [Line Items] |  |
Revenue growth percentage | 9.00% | 4.00%

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_BusinessAcquisitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Estimated weighted average cost of capital. + References No definition available. + Details
Name: | wetf_EstimatedWeightedAverageCostOfCapital
Namespace Prefix: | wetf_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage Of Revenue Growth + References No definition available. + Details
Name: | wetf_PercentageOfRevenueGrowth
Namespace Prefix: | wetf_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=wetf_AcquisitionOfEtfsBusinessMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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: |