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ETF Shareholder Proxy Solicitation (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Etf Shareholder Proxy Solicitation (Textual) [Abstract]
Percentage of common stock own by beneficial owner	25.50%
Reduced percentage of common stock owned by beneficial owner due to sell or transfer	25.00%
Threshold percentage of ownership presumes change in control	25.00%
ETF shareholders proxy	$ 3,264

X

- Definition

ETF shareholder proxy.

+ References

No definition available.

+ Details

Name:	wetf_EtfShareholderProxy
Namespace Prefix:	wetf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	wetf_EtfShareholderProxySolicitationTextualAbstract
Namespace Prefix:	wetf_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of common stock own by beneficial owner.

+ References

No definition available.

+ Details

Name:	wetf_PercentageOfCommonStockOwnByBeneficialOwner
Namespace Prefix:	wetf_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Reduced percentage of common stock own by beneficial owner due to sell or transfer.

+ References

No definition available.

+ Details

Name:	wetf_ReducedPercentageOfCommonStockOwnByBeneficialOwnerDueToSellOrTransfer
Namespace Prefix:	wetf_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Threshold percentage of ownership presumes change in control.

+ References

No definition available.

+ Details

Name:	wetf_ThresholdPercentageOfOwnershipPresumesChangeInControl
Namespace Prefix:	wetf_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration