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Property and equipment (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 205us-gaap_PropertyPlantAndEquipmentGross $ 164us-gaap_PropertyPlantAndEquipmentGross
Less: Accumulated depreciation (162)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (119)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Total 43us-gaap_PropertyPlantAndEquipmentNet 45us-gaap_PropertyPlantAndEquipmentNet
Computer hardware and software [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 193us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ComputerEquipmentMember		 152us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ComputerEquipmentMember
Furniture and Fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 12us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember		 $ 12us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember