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Income Taxes - Schedule of Reconciliation of Gross Net Operating Loss (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Tax Disclosure [Abstract]        
Net operating losses $ 109,839us-gaap_OperatingLossCarryforwards $ 140,959us-gaap_OperatingLossCarryforwards $ 136,515us-gaap_OperatingLossCarryforwards $ 106,939us-gaap_OperatingLossCarryforwards
Net operating losses deemed worthless (3,487)wetf_DeferredTaxAssetsNetOperatingLossesDeemedWorthless (3,487)wetf_DeferredTaxAssetsNetOperatingLossesDeemedWorthless    
Unrecognized stock-based compensation (101,108)wetf_DeferredTaxAssetsTaxDeferredExpenseUnrecognizedStockBasedCompensation (111,635)wetf_DeferredTaxAssetsTaxDeferredExpenseUnrecognizedStockBasedCompensation    
Gross net operating losses available for deferred tax asset 5,244us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 25,837us-gaap_DeferredTaxAssetsOperatingLossCarryforwards    
Tax rate 38.38%wetf_DeferredTaxAssetsFederalStatutoryIncomeTaxRate 45.43%wetf_DeferredTaxAssetsFederalStatutoryIncomeTaxRate    
Tax affected $ 2,013wetf_DeferredTaxAssetsOperatingLossCarryforwardsFederal $ 11,738wetf_DeferredTaxAssetsOperatingLossCarryforwardsFederal