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Property and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Property And Equipment Details    
Computers $ 110us-gaap_CapitalizedComputerSoftwareGross $ 9us-gaap_CapitalizedComputerSoftwareGross
Office furniture and equipment 97us-gaap_FurnitureAndFixturesGross 94us-gaap_FurnitureAndFixturesGross
Leasehold improvements 229us-gaap_LeaseholdImprovementsGross 229us-gaap_LeaseholdImprovementsGross
Total cost 336us-gaap_PropertyPlantAndEquipmentGross 332us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation and amortization (332)spex_AccumulatedDepreciationAndAmortization (332)spex_AccumulatedDepreciationAndAmortization
Property and equipment, net $ 4us-gaap_PropertyPlantAndEquipmentNet