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Commitments and Contingencies - Schedule of Future Minimum Lease Payments (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]  
Remainder of 2015 $ 2,440us-gaap_OperatingLeasesFutureMinimumPaymentsRemainderOfFiscalYear
2016 2,976us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears
2017 2,787us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears
2018 and thereafter 32,414wetf_OperatingLeasesFutureMinimumPaymentsDueInYearFourAndThereafter
Total $ 40,617us-gaap_OperatingLeasesFutureMinimumPaymentsDue