XML 91 R63.htm IDEA: XBRL DOCUMENT v2.4.1.9

Balance Sheet Details (Details) (USD $)	3 Months Ended			12 Months Ended			3 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jan. 31, 2013 sqft	Nov. 04, 2011 sqft
Property, plant and equipment, net
Property, plant and equipment, gross	$ 123,456,000us-gaap_PropertyPlantAndEquipmentGross			$ 122,116,000us-gaap_PropertyPlantAndEquipmentGross	$ 123,456,000us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation and amortization	(50,814,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment			(58,093,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	(50,814,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property, plant and equipment, net	72,642,000us-gaap_PropertyPlantAndEquipmentNet			64,023,000us-gaap_PropertyPlantAndEquipmentNet	72,642,000us-gaap_PropertyPlantAndEquipmentNet
Restructuring costs	2,200,000us-gaap_RestructuringCharges	1,100,000us-gaap_RestructuringCharges	2,200,000us-gaap_RestructuringCharges	39,000us-gaap_RestructuringCharges	5,546,000us-gaap_RestructuringCharges	7,301,000us-gaap_RestructuringCharges
Construction in progress, capitalized	40,320,000rmbs_PropertyPlantAndEquipmentCostCapitalizationAmount			40,300,000rmbs_PropertyPlantAndEquipmentCostCapitalizationAmount	40,320,000rmbs_PropertyPlantAndEquipmentCostCapitalizationAmount
Depreciation expense				13,625,000us-gaap_Depreciation	15,451,000us-gaap_Depreciation	13,190,000us-gaap_Depreciation
Building
Property, plant and equipment, net
Property, plant and equipment, gross	40,320,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingMember			40,320,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingMember	40,320,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingMember
Computer software
Property, plant and equipment, net
Property, plant and equipment, gross	22,068,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ComputerSoftwareIntangibleAssetMember			21,412,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ComputerSoftwareIntangibleAssetMember	22,068,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ComputerSoftwareIntangibleAssetMember
Computer equipment
Property, plant and equipment, net
Property, plant and equipment, gross	29,869,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ComputerEquipmentMember			27,744,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ComputerEquipmentMember	29,869,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ComputerEquipmentMember
Furniture and fixtures
Property, plant and equipment, net
Property, plant and equipment, gross	12,360,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_FurnitureAndFixturesMember			13,464,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_FurnitureAndFixturesMember	12,360,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_FurnitureAndFixturesMember
Leasehold improvements
Property, plant and equipment, net
Property, plant and equipment, gross	7,024,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LeaseholdImprovementsMember			7,052,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LeaseholdImprovementsMember	7,024,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LeaseholdImprovementsMember
Machinery
Property, plant and equipment, net
Property, plant and equipment, gross	11,533,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_MachineryAndEquipmentMember			11,699,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_MachineryAndEquipmentMember	11,533,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_MachineryAndEquipmentMember
Construction in progress
Property, plant and equipment, net
Property, plant and equipment, gross	282,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ConstructionInProgressMember			425,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ConstructionInProgressMember	282,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ConstructionInProgressMember
LDT | Building Improvements
Property, plant and equipment, net
Tangible asset impairment charges	3,500,000us-gaap_TangibleAssetImpairmentCharges / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingImprovementsMember / us-gaap_StatementBusinessSegmentsAxis = rmbs_LightingAndDisplayTechnologyLdtMember						5,800,000us-gaap_TangibleAssetImpairmentCharges / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingImprovementsMember / us-gaap_StatementBusinessSegmentsAxis = rmbs_LightingAndDisplayTechnologyLdtMember
LDT | Computer software
Property, plant and equipment, net
Tangible asset impairment charges	200,000us-gaap_TangibleAssetImpairmentCharges / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ComputerSoftwareIntangibleAssetMember / us-gaap_StatementBusinessSegmentsAxis = rmbs_LightingAndDisplayTechnologyLdtMember						600,000us-gaap_TangibleAssetImpairmentCharges / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ComputerSoftwareIntangibleAssetMember / us-gaap_StatementBusinessSegmentsAxis = rmbs_LightingAndDisplayTechnologyLdtMember
LDT | Machinery
Property, plant and equipment, net
Tangible asset impairment charges	500,000us-gaap_TangibleAssetImpairmentCharges / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_MachineryAndEquipmentMember / us-gaap_StatementBusinessSegmentsAxis = rmbs_LightingAndDisplayTechnologyLdtMember
Facility Closing [Member]
Property, plant and equipment, net
Restructuring costs					$ 2,000,000us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember
MTSPELLC Amended [Member]
Property, plant and equipment, net
Total space under lease (in square feet)								31,000us-gaap_AreaOfRealEstateProperty / rmbs_OperatingLeaseCommitmentAxis = rmbs_MtspellcAmendedMember	31,000us-gaap_AreaOfRealEstateProperty / rmbs_OperatingLeaseCommitmentAxis = rmbs_MtspellcAmendedMember

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