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Property and Equipment - Schedule of Property and Equipment (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Abstract]    
Computer equipment and purchased software $ 3,487immr_ComputerEquipmentAndPurchasedSoftwareGross $ 3,418immr_ComputerEquipmentAndPurchasedSoftwareGross
Machinery and equipment 865us-gaap_MachineryAndEquipmentGross 688us-gaap_MachineryAndEquipmentGross
Furniture and fixtures 1,065us-gaap_FurnitureAndFixturesGross 852us-gaap_FurnitureAndFixturesGross
Leasehold improvements 2,523us-gaap_LeaseholdImprovementsGross 1,295us-gaap_LeaseholdImprovementsGross
Total 7,940us-gaap_PropertyPlantAndEquipmentGross 6,253us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation (5,359)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (5,046)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property and equipment, net $ 2,581us-gaap_PropertyPlantAndEquipmentNet $ 1,207us-gaap_PropertyPlantAndEquipmentNet