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Investment - Summary of table below presents the inputs used in backsolve valuation approach as follows (Detail) - Fair Value, Inputs, Level 3 [Member] | Mar. 08, 2021 yr
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Measurement Input Expected Volatility [Member] |
Investments Fair Value Disclosure [Line Items] |
Expected volatility | 55.00%
Measurement Input, Expected Term [Member] |
Investments Fair Value Disclosure [Line Items] |
Time to exit (in years) | 5

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- Definition Fair Value Assumption, Expected Term. + References No definition available. + Details
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Namespace Prefix: | wetf_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Fair Value Assumption, Expected Volatility Rate. + References No definition available. + Details
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Namespace Prefix: | wetf_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Investments, Fair Value Disclosure. + References No definition available. + Details
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Namespace Prefix: | wetf_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |