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

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