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Income Taxes - Deferred Tax Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets:    
Net operating losses $ 2,013wetf_DeferredTaxAssetsOperatingLossCarryforwardsFederal $ 11,738wetf_DeferredTaxAssetsOperatingLossCarryforwardsFederal
Foreign net operating losses 816us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign  
Stock-based compensation 6,046us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 7,579us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Accrued expenses 5,236us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals  
Deferred rent liability 2,170us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsDeferredRent 1,855us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsDeferredRent
Other 82us-gaap_DeferredTaxAssetsOther 82us-gaap_DeferredTaxAssetsOther
Deferred tax assets 16,363us-gaap_DeferredTaxAssetsGross 21,254us-gaap_DeferredTaxAssetsGross
Deferred tax liabilities:    
Incentive compensation 4,092wetf_DeferredTaxLiabilitiesIncentiveCompensation  
Fixed assets 1,965us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment 7us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Unrealized gains   26us-gaap_DeferredTaxLiabilitiesUnrealizedCurrencyTransactionGains
Deferred tax liabilities 6,057us-gaap_DeferredIncomeTaxLiabilities 33us-gaap_DeferredIncomeTaxLiabilities
Total deferred tax assets less deferred tax liabilities 10,306wetf_DeferredTaxAssetsLiabilitiesGross 21,221wetf_DeferredTaxAssetsLiabilitiesGross
Less: valuation allowance (816)us-gaap_DeferredTaxAssetsValuationAllowance (21,221)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax assets and liabilities $ 9,490us-gaap_DeferredTaxAssetsLiabilitiesNet