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Property and Equipment (Details) (USD $)
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12 Months Ended | ||
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Property, Plant and Equipment [Line Items] | |||
| Land | $ 695,000us-gaap_Land | $ 695,000us-gaap_Land | |
| Building and improvements | 11,076,000us-gaap_BuildingsAndImprovementsGross | 7,902,000us-gaap_BuildingsAndImprovementsGross | |
| Engineering and test equipment | 11,970,000us-gaap_MachineryAndEquipmentGross | 11,631,000us-gaap_MachineryAndEquipmentGross | |
| Computer Equipment And Software Gross | 27,678,000idcc_ComputerEquipmentAndSoftwareGross | 25,368,000idcc_ComputerEquipmentAndSoftwareGross | |
| Furniture and fixtures | 1,292,000us-gaap_FurnitureAndFixturesGross | 1,166,000us-gaap_FurnitureAndFixturesGross | |
| Leasehold improvements | 7,406,000us-gaap_LeaseholdImprovementsGross | 6,477,000us-gaap_LeaseholdImprovementsGross | |
| Property and equipment, gross | 60,117,000us-gaap_PropertyPlantAndEquipmentGross | 53,239,000us-gaap_PropertyPlantAndEquipmentGross | |
| Less: accumulated depreciation | (47,571,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment | (43,704,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment | |
| Property and equipment, net | 12,546,000us-gaap_PropertyPlantAndEquipmentNet | 9,535,000us-gaap_PropertyPlantAndEquipmentNet | |
| Depreciation | 3,900,000us-gaap_Depreciation | 3,600,000us-gaap_Depreciation | 3,600,000us-gaap_Depreciation |
| Capitalized Computer Software, Amortization | 1,400,000us-gaap_CapitalizedComputerSoftwareAmortization | 1,000,000us-gaap_CapitalizedComputerSoftwareAmortization | 1,000,000us-gaap_CapitalizedComputerSoftwareAmortization |
| Capitalized Computer Software, Accumulated Amortization | 14,300,000us-gaap_CapitalizedComputerSoftwareAccumulatedAmortization | 12,700,000us-gaap_CapitalizedComputerSoftwareAccumulatedAmortization | |
| Capitalized Computer Software, Net | $ 2,200,000us-gaap_CapitalizedComputerSoftwareNet | $ 2,500,000us-gaap_CapitalizedComputerSoftwareNet | |
| X | ||||||||||
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- Definition
Carrying amount as of the balance sheet date of long lived, depreciable assets that are used in the creation, maintenance and utilization of information systems, capitalized costs of purchased software applications, and capitalized costs of computer equipment and hardware No definition available.
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| X | ||||||||||
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- Definition
Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount before accumulated depreciation of building structures held for productive use including addition, improvement, or renovation to the structure, including, but not limited to, interior masonry, interior flooring, electrical, and plumbing. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
For each balance sheet presented, the amount of accumulated amortization for capitalized computer software costs. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
For each income statement presented, the amount charged to expense for amortization of capitalized computer software costs. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The carrying amount of capitalized computer software costs net of accumulated amortization as of the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount before accumulated depreciation of equipment commonly used in offices and stores that have no permanent connection to the structure of a building or utilities. Examples include, but are not limited to, desks, chairs, tables, and bookcases. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount before accumulated depletion of real estate held for productive use, excluding land held for sale. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount before accumulated depreciation of additions or improvements to assets held under a lease arrangement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount before accumulated depreciation of tangible personal property used to produce goods and services, including, but is not limited to, tools, dies and molds, computer and office equipment. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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| X | ||||||||||
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- Definition
Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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