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AdvisorEngine - Financial Interests - Summary of Ranges and Weighted Averages of Significant Unobservable Inputs Used to Determine Enterprise Value (Details) | Sep. 30, 2020
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Measurement Input Forecasted Revenue as a Percentage of the Pre-Defined Revenue Targets [Member] | Maximum [Member] |
Forecasted revenue as a percentage of pre-defined revenue target to measure contingent payments | 0.71
Measurement Input Forecasted Revenue as a Percentage of the Pre-Defined Revenue Targets [Member] | Minimum [Member] |
Forecasted revenue as a percentage of pre-defined revenue target to measure contingent payments | 0.34
Measurement Input Forecasted Revenue as a Percentage of the Pre-Defined Revenue Targets [Member] | Weighted Average [Member] |
Forecasted revenue as a percentage of pre-defined revenue target to measure contingent payments | 0.47
Measurement Input Revenue Volatility [Member] |
Revenue Volatility used to measure contingent payment | 0.25

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- Definition Forecasted revenue as a percentage of pre-defined revenue target to measure contingent payments. + References No definition available. + Details
Name: | wetf_ForecastedRevenueAsAPercentageOfPredefinedRevenueTargetToMeasureContingentPayments
Namespace Prefix: | wetf_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

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- Definition Revenue volatility used to measure contingent payment. + References No definition available. + Details
Name: | wetf_RevenueVolatilityUsedToMeasureContingentPayment
Namespace Prefix: | wetf_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_MeasurementInputTypeAxis=wetf_MeasurementInputForcastedRevenueTargetRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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

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- Details
Name: | us-gaap_MeasurementInputTypeAxis=wetf_MeasurementInputRevenueVolatilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |