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Public Offerings - Additional Information (Detail) (USD $) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2012 | Feb. 29, 2012 | Dec. 31, 2012
Equity [Abstract] |  |  |
Public offering of common stock per share amount | $ 6.10us-gaap_SharePrice | $ 5.61us-gaap_SharePrice |
Shares sold by company |  | 1,000,000us-gaap_StockIssuedDuringPeriodSharesNewIssues |
Number of shares sold by stockholders | 27,795,630wetf_NumberOfSharesSoldByStockholders | 15,516,587wetf_NumberOfSharesSoldByStockholders |
Proceeds after commissions and other direct selling expenses |  | $ 4,329,000us-gaap_ProceedsFromIssuanceOfCommonStock | $ 4,329,000us-gaap_ProceedsFromIssuanceOfCommonStock
Sale of Stock, Consideration Received on Transaction | 0us-gaap_SaleOfStockConsiderationReceivedOnTransaction |  |
Proceeds from Existing Shareholders on Sale | 0wetf_ProceedsFromExistingShareholdersOnSale |  |
Expenses related to offering |  |  | $ 353,000wetf_ExchangeListing

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- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition Number of new stock issued during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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