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Income Taxes - Additional Information (Detail) (USD $)
 0 Months Ended 12 Months Ended 3 Months Ended
Dec. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Sep. 30, 2014
Mar. 31, 2014
Schedule Of Income Tax [Line Items]            
Net operating losses expiration period   20 years        
NOLs available for deferred tax asset $ 5,244,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards $ 5,244,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards $ 25,837,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards      
Deferred tax asset offset by a valuation allowance 816,000us-gaap_DeferredTaxAssetsValuationAllowance 816,000us-gaap_DeferredTaxAssetsValuationAllowance 21,221,000us-gaap_DeferredTaxAssetsValuationAllowance      
Unrecognized stock-based compensation 101,108,000wetf_DeferredTaxAssetsTaxDeferredExpenseUnrecognizedStockBasedCompensation 101,108,000wetf_DeferredTaxAssetsTaxDeferredExpenseUnrecognizedStockBasedCompensation 111,635,000wetf_DeferredTaxAssetsTaxDeferredExpenseUnrecognizedStockBasedCompensation      
Valuation allowance resulting in income tax benefit 5,618,000us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent 5,618,000us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent       21,221,000us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent
Deferred tax asset resulting from foreign losses 816,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign 816,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign        
Credit to additional paid-in capital for the amount of NOLs from stock-based compensation   21,893,000us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation        
Current baseline operating tax rate   16.99%us-gaap_EffectiveIncomeTaxRateContinuingOperations 0.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations 0.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations    
Federal statutory rate   35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate    
Uncertain tax positions, interest or penalties amount 0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense          
Income tax examination description   Tax returns filed with each jurisdiction remain open to examination under the normal three-year statute of limitations.        
Previously Reported [Member] | State Income Tax [Member]            
Schedule Of Income Tax [Line Items]            
Current baseline operating tax rate         45.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		  
Restatement Adjustment [Member] | State Income Tax [Member]            
Schedule Of Income Tax [Line Items]            
Current baseline operating tax rate         38.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember		  
Foreign Subsidiaries [Member]            
Schedule Of Income Tax [Line Items]            
NOLs available for deferred tax asset 4,061,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
/ us-gaap_StatementGeographicalAxis
= wetf_ForeignSubsidiariesMember		 4,061,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
/ us-gaap_StatementGeographicalAxis
= wetf_ForeignSubsidiariesMember		        
Deferred tax asset offset by a valuation allowance $ 816,000us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_StatementGeographicalAxis
= wetf_ForeignSubsidiariesMember		 $ 816,000us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_StatementGeographicalAxis
= wetf_ForeignSubsidiariesMember