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Income Taxes - Schedule of Reconciliation of Gross Net Operating Loss (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |  |
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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 |  |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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