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Property, Plant and Equipment, net - Schedule of Property Plant and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Abstract]    
Land and land improvements $ 7,875us-gaap_LandAndLandImprovements $ 7,565us-gaap_LandAndLandImprovements
Buildings and building improvements 7,201us-gaap_BuildingsAndImprovementsGross 7,265us-gaap_BuildingsAndImprovementsGross
Furniture and fixtures 1,415us-gaap_FurnitureAndFixturesGross 1,236us-gaap_FurnitureAndFixturesGross
Equipment 33,049us-gaap_MachineryAndEquipmentGross 31,983us-gaap_MachineryAndEquipmentGross
Leasehold improvements 6,422us-gaap_LeaseholdImprovementsGross 6,382us-gaap_LeaseholdImprovementsGross
Computer hardware and software 5,221xon_ComputerHardwareandSoftware 5,060xon_ComputerHardwareandSoftware
Construction in progress 837us-gaap_ConstructionInProgressGross 1,002us-gaap_ConstructionInProgressGross
Property, plant and equipment, gross 62,020us-gaap_PropertyPlantAndEquipmentGross 60,493us-gaap_PropertyPlantAndEquipmentGross
Less: Accumulated depreciation and amortization (24,005)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (22,493)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property, plant and equipment, net $ 38,015us-gaap_PropertyPlantAndEquipmentNet $ 38,000us-gaap_PropertyPlantAndEquipmentNet