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Selected Balance Sheet Information (Details 1) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 122us-gaap_PropertyPlantAndEquipmentGross $ 104us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation (47)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (39)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Total 75us-gaap_PropertyPlantAndEquipmentNet 65us-gaap_PropertyPlantAndEquipmentNet
Computer and office equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 111us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= syn_ComputerAndOfficeEquipmentMember		 93us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= syn_ComputerAndOfficeEquipmentMember
Software [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 11us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember		 $ 11us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember