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Income Taxes - Schedule of Annual Limitations for Net Operating Losses (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Summary Of Tax Credit Carry Forward And Operating Loss Carry Forwards [Line Items]
Total	$ 109,839us-gaap_OperatingLossCarryforwards	$ 140,959us-gaap_OperatingLossCarryforwards	$ 136,515us-gaap_OperatingLossCarryforwards	$ 106,939us-gaap_OperatingLossCarryforwards
Annual Prospective Limitation	524wetf_NetOperatingLossAnnualLimitation
Annual Deemed Worthless	3,487
1998 - 2004 [Member]
Summary Of Tax Credit Carry Forward And Operating Loss Carry Forwards [Line Items]
Total	8,731
Annual Prospective Limitation	524
Annual Deemed Worthless	3,487
2005 - 2013 [Member]
Summary Of Tax Credit Carry Forward And Operating Loss Carry Forwards [Line Items]
Total	$ 101,108