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Income Taxes - Schedule of Net Operating Loss Expiration (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Operating Loss Carryforwards [Line Items]  
Net operating loss expiration amount $ 109,839wetf_NetOperatingLossExpirationAmount
2018 [Member]  
Operating Loss Carryforwards [Line Items]  
Net operating loss expiration amount 502wetf_NetOperatingLossExpirationAmount
/ us-gaap_StatementScenarioAxis
= wetf_TwoThousandEighteenMember
2019 [Member]  
Operating Loss Carryforwards [Line Items]  
Net operating loss expiration amount 5,101wetf_NetOperatingLossExpirationAmount
/ us-gaap_StatementScenarioAxis
= wetf_TwoThousandNineteenMember
2021 [Member]  
Operating Loss Carryforwards [Line Items]  
Net operating loss expiration amount 579wetf_NetOperatingLossExpirationAmount
/ us-gaap_StatementScenarioAxis
= wetf_TwoThousandTwentyOneMember
2023 [Member]  
Operating Loss Carryforwards [Line Items]  
Net operating loss expiration amount 608wetf_NetOperatingLossExpirationAmount
/ us-gaap_StatementScenarioAxis
= wetf_TwoThousandTwentyThreeMember
2024 [Member]  
Operating Loss Carryforwards [Line Items]  
Net operating loss expiration amount 1,942wetf_NetOperatingLossExpirationAmount
/ us-gaap_StatementScenarioAxis
= wetf_TwoThousandTwentyFourMember
2027 [Member]  
Operating Loss Carryforwards [Line Items]  
Net operating loss expiration amount 18,039wetf_NetOperatingLossExpirationAmount
/ us-gaap_StatementScenarioAxis
= wetf_TwoThousandTwentySevenMember
2028 [Member]  
Operating Loss Carryforwards [Line Items]  
Net operating loss expiration amount 19,754wetf_NetOperatingLossExpirationAmount
/ us-gaap_StatementScenarioAxis
= wetf_TwoThousandTwentyEightMember
2029 [Member]  
Operating Loss Carryforwards [Line Items]  
Net operating loss expiration amount 14,218wetf_NetOperatingLossExpirationAmount
/ us-gaap_StatementScenarioAxis
= wetf_TwoThousandTwentyNineMember
2030 [Member]  
Operating Loss Carryforwards [Line Items]  
Net operating loss expiration amount 6,385wetf_NetOperatingLossExpirationAmount
/ us-gaap_StatementScenarioAxis
= wetf_TwoThousandThirtyMember
2031 [Member]  
Operating Loss Carryforwards [Line Items]  
Net operating loss expiration amount 6,052wetf_NetOperatingLossExpirationAmount
/ us-gaap_StatementScenarioAxis
= wetf_TwoThousandThirtyOneMember
2032 [Member]  
Operating Loss Carryforwards [Line Items]  
Net operating loss expiration amount 32,215wetf_NetOperatingLossExpirationAmount
/ us-gaap_StatementScenarioAxis
= wetf_TwoThousandThirtyTwoMember
2033 [Member]  
Operating Loss Carryforwards [Line Items]  
Net operating loss expiration amount $ 4,444wetf_NetOperatingLossExpirationAmount
/ us-gaap_StatementScenarioAxis
= wetf_TwoThousandThirtyThreeMember