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Income Taxes - Reconciliation of Statutory Federal Income Tax Rate and Company's Effective Rate (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Federal statutory rate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Permanent differences	0.69%wetf_EffectiveIncomeTaxRateReconciliationPermanentDifferences	0.09%wetf_EffectiveIncomeTaxRateReconciliationPermanentDifferences	0.37%wetf_EffectiveIncomeTaxRateReconciliationPermanentDifferences
State income tax rate, net of federal benefit	1.55%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	10.06%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	9.44%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Foreign tax differential	0.82%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
Decrease in valuation allowance	(27.74%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	(45.13%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	(44.82%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Change in effective state rate	6.86%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate
Other differences, net	(0.19%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments	(0.02%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.01%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective rate	16.99%us-gaap_EffectiveIncomeTaxRateContinuingOperations	0.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations	0.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations

X

- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 12

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-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(h)(2))

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-Publisher SEC

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-Number 210

-Section 08

-Paragraph h

-Subparagraph 2

-Article 4

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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