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Significant Accounting Policies (Details)	9 Months Ended
	Sep. 30, 2012
Equipment [Member]
Schedule of estimated useful lives of related assets
Estimated useful lives	3 years
Furniture and fixtures [Member]
Schedule of estimated useful lives of related assets
Estimated useful lives	7 years

X

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

Name:	us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

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