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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 $ 9,700,000rmbs_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   116,899,000us-gaap_Goodwill 124,969,000us-gaap_Goodwill      
Addition to goodwill   0us-gaap_GoodwillAcquiredDuringPeriod 0us-gaap_GoodwillAcquiredDuringPeriod      
Goodwill impairment charge   0us-gaap_GoodwillImpairmentLoss 8,070,000us-gaap_GoodwillImpairmentLoss      
Balance at the end of the period 116,899,000us-gaap_Goodwill 116,899,000us-gaap_Goodwill 116,899,000us-gaap_Goodwill      
Intellectual Property [Member]            
Goodwill information            
Assets held for sale   2,300,000us-gaap_DisposalGroupIncludingDiscontinuedOperationIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_IntellectualPropertyMember
       
LDT            
Goodwill information            
Impairment charge 4,000,000us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ us-gaap_StatementBusinessSegmentsAxis
= rmbs_LightingAndDisplayTechnologyLdtMember
    15,400,000us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ us-gaap_StatementBusinessSegmentsAxis
= rmbs_LightingAndDisplayTechnologyLdtMember
   
Impairment charge for tangible and intangible assets       21,800,000rmbs_ImpairmentChargeForTangibleAndIntangibleAssets
/ us-gaap_StatementBusinessSegmentsAxis
= rmbs_LightingAndDisplayTechnologyLdtMember
   
Remaining long-lived assets 12,900,000us-gaap_NoncurrentAssets
/ us-gaap_StatementBusinessSegmentsAxis
= rmbs_LightingAndDisplayTechnologyLdtMember
  12,900,000us-gaap_NoncurrentAssets
/ us-gaap_StatementBusinessSegmentsAxis
= rmbs_LightingAndDisplayTechnologyLdtMember
     
Goodwill information for each reporting unit            
Goodwill impairment charge       13,700,000us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= rmbs_LightingAndDisplayTechnologyLdtMember
   
LDT | Building Improvements            
Goodwill information            
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 | Machinery            
Goodwill information            
Tangible asset impairment charges 500,000us-gaap_TangibleAssetImpairmentCharges
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_MachineryAndEquipmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= rmbs_LightingAndDisplayTechnologyLdtMember
         
LDT | Computer software            
Goodwill information            
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
   
MID            
Goodwill information            
Fair value of goodwill 19,900,000us-gaap_GoodwillFairValueDisclosure
/ us-gaap_StatementBusinessSegmentsAxis
= rmbs_MidSegmentMember
19,900,000us-gaap_GoodwillFairValueDisclosure
/ us-gaap_StatementBusinessSegmentsAxis
= rmbs_MidSegmentMember
19,900,000us-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   19,905,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= rmbs_MidSegmentMember
19,905,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= rmbs_MidSegmentMember
     
Addition to goodwill   0us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= rmbs_MidSegmentMember
0us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= rmbs_MidSegmentMember
     
Goodwill impairment charge   0us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= rmbs_MidSegmentMember
0us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= rmbs_MidSegmentMember
     
Balance at the end of the period 19,905,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= rmbs_MidSegmentMember
19,905,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= rmbs_MidSegmentMember
19,905,000us-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         8,100,000us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= rmbs_ESDSegmentMember
 
CRI            
Goodwill information            
Impairment charge 1,500,000us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ us-gaap_StatementBusinessSegmentsAxis
= rmbs_CriMember
         
Remaining long-lived assets 99,400,000us-gaap_NoncurrentAssets
/ us-gaap_StatementBusinessSegmentsAxis
= rmbs_CriMember
  99,400,000us-gaap_NoncurrentAssets
/ us-gaap_StatementBusinessSegmentsAxis
= rmbs_CriMember
     
Fair value of goodwill 97,000,000us-gaap_GoodwillFairValueDisclosure
/ us-gaap_StatementBusinessSegmentsAxis
= rmbs_CriMember
97,000,000us-gaap_GoodwillFairValueDisclosure
/ us-gaap_StatementBusinessSegmentsAxis
= rmbs_CriMember
97,000,000us-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   96,994,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= rmbs_CriMember
96,994,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= rmbs_CriMember
     
Addition to goodwill   0us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= rmbs_CriMember
0us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= rmbs_CriMember
     
Goodwill impairment charge   0us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= rmbs_CriMember
0us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= rmbs_CriMember
     
Balance at the end of the period 96,994,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= rmbs_CriMember
96,994,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= rmbs_CriMember
96,994,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= rmbs_CriMember
     
Other            
Goodwill information for each reporting unit            
Balance at the beginning of the period     8,070,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
     
Addition to goodwill     0us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
     
Goodwill impairment charge     8,070,000us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
     
Balance at the end of the period $ 0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
$ 0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
$ 0us-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