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Earnings Per Shares - Schedule of Weighted Average Number of Shares (Parenthetical) (Detail) | 3 Months Ended
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Mar. 31, 2020 shares
Earnings Per Share [Abstract] |
Participating Securities | 15,025
Potentially Dilutive common stock equivalents | 16

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- References No definition available. + Details
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Period Type: | duration

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- Definition Potentially Dilutive Common Stock Equivalents. + References No definition available. + Details
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Namespace Prefix: | wetf_
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Period Type: | duration

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- Definition Participating Securities + References No definition available. + Details
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Balance Type: | na
Period Type: | duration