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Income Taxes - Schedule of Net Operating Losses for Tax Purpose - Non-U.S. (Detail) $ in Thousands	Jun. 30, 2015 USD ($)
Foreign Subsidiaries [Member]
Operating Loss Carryforwards [Line Items]
Foreign subsidiaries loss	$ (3,095)

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_OperatingLossCarryforwardsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Deferred Tax Assets Net Operating Loss

+ References

No definition available.

+ Details

Name:	wetf_DeferredTaxAssetsNetOperatingLoss
Namespace Prefix:	wetf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Details

Name:	us-gaap_StatementGeographicalAxis=wetf_ForeignSubsidiariesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: