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Geographic Information (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 1,734us-gaap_SalesRevenueNet	$ 1,084us-gaap_SalesRevenueNet
Net loss	(19,387)us-gaap_NetIncomeLoss	(10,153)us-gaap_NetIncomeLoss
Assets	29,387us-gaap_Assets	35,520us-gaap_Assets
Long Lived Assets, net	387us-gaap_PropertyPlantAndEquipmentNet	275us-gaap_PropertyPlantAndEquipmentNet
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net loss	(3,825)us-gaap_NetIncomeLoss / us-gaap_StatementGeographicalAxis = country_US	1,171us-gaap_NetIncomeLoss / us-gaap_StatementGeographicalAxis = country_US
Assets	19,094us-gaap_Assets / us-gaap_StatementGeographicalAxis = country_US	28,548us-gaap_Assets / us-gaap_StatementGeographicalAxis = country_US
Long Lived Assets, net	6us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US	5us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US
United States | Continuing operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Net loss	(3,844)us-gaap_NetIncomeLoss / us-gaap_StatementGeographicalAxis = country_US / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember	1,114us-gaap_NetIncomeLoss / us-gaap_StatementGeographicalAxis = country_US / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember
Assets	18,923us-gaap_Assets / us-gaap_StatementGeographicalAxis = country_US / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember	27,837us-gaap_Assets / us-gaap_StatementGeographicalAxis = country_US / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember
Long Lived Assets, net	6us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember	5us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember
United States | Discontinued operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Net loss	19us-gaap_NetIncomeLoss / us-gaap_StatementGeographicalAxis = country_US / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember	57us-gaap_NetIncomeLoss / us-gaap_StatementGeographicalAxis = country_US / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember
Assets	171us-gaap_Assets / us-gaap_StatementGeographicalAxis = country_US / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember	711us-gaap_Assets / us-gaap_StatementGeographicalAxis = country_US / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember
Long Lived Assets, net
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	1,734us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_GB	1,084us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_GB
Net loss	(17,296)us-gaap_NetIncomeLoss / us-gaap_StatementGeographicalAxis = country_GB	(11,324)us-gaap_NetIncomeLoss / us-gaap_StatementGeographicalAxis = country_GB
Assets	10,293us-gaap_Assets / us-gaap_StatementGeographicalAxis = country_GB	6,972us-gaap_Assets / us-gaap_StatementGeographicalAxis = country_GB
Long Lived Assets, net	$ 381us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_GB	$ 270us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_GB

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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