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Intangible Assets and Goodwill (Details) (USD $) | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Dec. 31, 2012
Goodwill information |  |  |  |  |  |
Impairment charge for tangible and intangible assets | $ 9,700,000 rmbs_ImpairmentChargeForTangibleAndIntangibleAssets |  |  |  |  |
Terminal growth rate for key assumptions used in applying income approach |  | 3.00%us-gaap_FairValueInputsLongTermRevenueGrowthRate | 3.00%us-gaap_FairValueInputsLongTermRevenueGrowthRate |  |  |
Goodwill information for each reporting unit |  |  |  |  |  |
Balance at the beginning of the period |  | 116,899,000 us-gaap_Goodwill | 124,969,000 us-gaap_Goodwill |  |  |
Addition to goodwill |  | 0 us-gaap_GoodwillAcquiredDuringPeriod | 0 us-gaap_GoodwillAcquiredDuringPeriod |  |  |
Goodwill impairment charge |  | 0 us-gaap_GoodwillImpairmentLoss | 8,070,000 us-gaap_GoodwillImpairmentLoss |  |  |
Balance at the end of the period | 116,899,000 us-gaap_Goodwill | 116,899,000 us-gaap_Goodwill | 116,899,000 us-gaap_Goodwill |  |  |
Intellectual Property [Member] |  |  |  |  |  |
Goodwill information |  |  |  |  |  |
Assets held for sale |  | 2,300,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_IntellectualPropertyMember |  |  |  |
LDT |  |  |  |  |  |
Goodwill information |  |  |  |  |  |
Impairment charge | 4,000,000 us-gaap_ImpairmentOfIntangibleAssetsFinitelived / us-gaap_StatementBusinessSegmentsAxis = rmbs_LightingAndDisplayTechnologyLdtMember |  |  | 15,400,000 us-gaap_ImpairmentOfIntangibleAssetsFinitelived / us-gaap_StatementBusinessSegmentsAxis = rmbs_LightingAndDisplayTechnologyLdtMember |  |
Impairment charge for tangible and intangible assets |  |  |  | 21,800,000 rmbs_ImpairmentChargeForTangibleAndIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = rmbs_LightingAndDisplayTechnologyLdtMember |  |
Remaining long-lived assets | 12,900,000 us-gaap_NoncurrentAssets / us-gaap_StatementBusinessSegmentsAxis = rmbs_LightingAndDisplayTechnologyLdtMember |  | 12,900,000 us-gaap_NoncurrentAssets / us-gaap_StatementBusinessSegmentsAxis = rmbs_LightingAndDisplayTechnologyLdtMember |  |  |
Goodwill information for each reporting unit |  |  |  |  |  |
Goodwill impairment charge |  |  |  | 13,700,000 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = rmbs_LightingAndDisplayTechnologyLdtMember |  |
LDT | Building Improvements |  |  |  |  |  |
Goodwill information |  |  |  |  |  |
Tangible asset impairment charges | 3,500,000 us-gaap_TangibleAssetImpairmentCharges / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingImprovementsMember / us-gaap_StatementBusinessSegmentsAxis = rmbs_LightingAndDisplayTechnologyLdtMember |  |  | 5,800,000 us-gaap_TangibleAssetImpairmentCharges / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingImprovementsMember / us-gaap_StatementBusinessSegmentsAxis = rmbs_LightingAndDisplayTechnologyLdtMember |  |
LDT | Machinery |  |  |  |  |  |
Goodwill information |  |  |  |  |  |
Tangible asset impairment charges | 500,000 us-gaap_TangibleAssetImpairmentCharges / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_MachineryAndEquipmentMember / us-gaap_StatementBusinessSegmentsAxis = rmbs_LightingAndDisplayTechnologyLdtMember |  |  |  |  |
LDT | Computer software |  |  |  |  |  |
Goodwill information |  |  |  |  |  |
Tangible asset impairment charges | 200,000 us-gaap_TangibleAssetImpairmentCharges / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ComputerSoftwareIntangibleAssetMember / us-gaap_StatementBusinessSegmentsAxis = rmbs_LightingAndDisplayTechnologyLdtMember |  |  | 600,000 us-gaap_TangibleAssetImpairmentCharges / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ComputerSoftwareIntangibleAssetMember / us-gaap_StatementBusinessSegmentsAxis = rmbs_LightingAndDisplayTechnologyLdtMember |  |
MID |  |  |  |  |  |
Goodwill information |  |  |  |  |  |
Fair value of goodwill | 19,900,000 us-gaap_GoodwillFairValueDisclosure / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember | 19,900,000 us-gaap_GoodwillFairValueDisclosure / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember | 19,900,000 us-gaap_GoodwillFairValueDisclosure / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember |  |  |
Percentage of fair value in excess of carrying amount | 480.00%us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember | 511.00%us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember | 480.00%us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember |  |  |
Discount rates for key assumptions used in applying income approach |  | 15.00%us-gaap_FairValueInputsDiscountRate / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember | 14.00%us-gaap_FairValueInputsDiscountRate / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember |  |  |
Goodwill information for each reporting unit |  |  |  |  |  |
Balance at the beginning of the period |  | 19,905,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember | 19,905,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember |  |  |
Addition to goodwill |  | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember |  |  |
Goodwill impairment charge |  | 0 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember | 0 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember |  |  |
Balance at the end of the period | 19,905,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember | 19,905,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember | 19,905,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember |  |  |
ESD Segment [Member] |  |  |  |  |  |
Goodwill information |  |  |  |  |  |
Discount rates for key assumptions used in applying income approach |  |  |  |  | 36.00%us-gaap_FairValueInputsDiscountRate / us-gaap_StatementBusinessSegmentsAxis = rmbs_ESDSegmentMember |
Goodwill information for each reporting unit |  |  |  |  |  |
Goodwill impairment charge |  |  |  |  | 8,100,000 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = rmbs_ESDSegmentMember |
CRI |  |  |  |  |  |
Goodwill information |  |  |  |  |  |
Impairment charge | 1,500,000 us-gaap_ImpairmentOfIntangibleAssetsFinitelived / us-gaap_StatementBusinessSegmentsAxis = rmbs_CriMember |  |  |  |  |
Remaining long-lived assets | 99,400,000 us-gaap_NoncurrentAssets / us-gaap_StatementBusinessSegmentsAxis = rmbs_CriMember |  | 99,400,000 us-gaap_NoncurrentAssets / us-gaap_StatementBusinessSegmentsAxis = rmbs_CriMember |  |  |
Fair value of goodwill | 97,000,000 us-gaap_GoodwillFairValueDisclosure / us-gaap_StatementBusinessSegmentsAxis = rmbs_CriMember | 97,000,000 us-gaap_GoodwillFairValueDisclosure / us-gaap_StatementBusinessSegmentsAxis = rmbs_CriMember | 97,000,000 us-gaap_GoodwillFairValueDisclosure / us-gaap_StatementBusinessSegmentsAxis = rmbs_CriMember |  |  |
Percentage of fair value in excess of carrying amount | 44.00%us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount / us-gaap_StatementBusinessSegmentsAxis = rmbs_CriMember | 53.00%us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount / us-gaap_StatementBusinessSegmentsAxis = rmbs_CriMember | 44.00%us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount / us-gaap_StatementBusinessSegmentsAxis = rmbs_CriMember |  |  |
Discount rates for key assumptions used in applying income approach |  | 22.00%us-gaap_FairValueInputsDiscountRate / us-gaap_StatementBusinessSegmentsAxis = rmbs_CriMember | 21.00%us-gaap_FairValueInputsDiscountRate / us-gaap_StatementBusinessSegmentsAxis = rmbs_CriMember |  |  |
Goodwill information for each reporting unit |  |  |  |  |  |
Balance at the beginning of the period |  | 96,994,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = rmbs_CriMember | 96,994,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = rmbs_CriMember |  |  |
Addition to goodwill |  | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = rmbs_CriMember | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = rmbs_CriMember |  |  |
Goodwill impairment charge |  | 0 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = rmbs_CriMember | 0 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = rmbs_CriMember |  |  |
Balance at the end of the period | 96,994,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = rmbs_CriMember | 96,994,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = rmbs_CriMember | 96,994,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = rmbs_CriMember |  |  |
Other |  |  |  |  |  |
Goodwill information for each reporting unit |  |  |  |  |  |
Balance at the beginning of the period |  |  | 8,070,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  |  |
Addition to goodwill |  |  | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  |  |
Goodwill impairment charge |  |  | 8,070,000 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  |  |
Balance at the end of the period | $ 0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | $ 0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | $ 0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  |  |
Minimum |  |  |  |  |  |
Goodwill information |  |  |  |  |  |
Discount rates for key assumptions used in applying income approach |  |  |  |  |  | 20.00%us-gaap_FairValueInputsDiscountRate / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum |  |  |  |  |  |
Goodwill information |  |  |  |  |  |
Discount rates for key assumptions used in applying income approach |  |  |  |  |  | 35.00%us-gaap_FairValueInputsDiscountRate / us-gaap_RangeAxis = us-gaap_MaximumMember

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- Definition Amount classified as intangible assets, excluding goodwill, attributable to disposal group held for sale or disposed of. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1107-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1436-107760 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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