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Intangible Assets and Goodwill (Details 3) (USD $)
12 Months Ended 1 Months Ended 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jun. 30, 2011
Dec. 31, 2013
Sep. 30, 2012
Purchased patents            
Amortization of intangible assets $ 26,618,000us-gaap_AmortizationOfIntangibleAssets $ 28,909,000us-gaap_AmortizationOfIntangibleAssets $ 30,345,000us-gaap_AmortizationOfIntangibleAssets      
Estimated future amortization expense of intangible assets            
2015 25,098,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths          
2016 24,318,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo          
2017 23,709,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree          
2018 10,827,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour          
2019 1,789,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive          
Thereafter 3,630,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive          
Finite-lived intangible assets 89,371,000us-gaap_FiniteLivedIntangibleAssetsNet 117,172,000us-gaap_FiniteLivedIntangibleAssetsNet     117,172,000us-gaap_FiniteLivedIntangibleAssetsNet  
Existing technology            
Estimated future amortization expense of intangible assets            
Finite-lived intangible assets 80,895,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
105,241,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
    105,241,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
 
Favorable contracts.            
Identified intangible assets assumed in the acquisition of CRI            
Cash received related to intangible assets 900,000rmbs_FiniteLivedIntangibleAssetsCashReceived
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LicensingAgreementsMember
2,300,000rmbs_FiniteLivedIntangibleAssetsCashReceived
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LicensingAgreementsMember
       
Estimated future amortization expense of intangible assets            
Finite-lived intangible assets 100,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LicensingAgreementsMember
1,000,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LicensingAgreementsMember
    1,000,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LicensingAgreementsMember
 
Non-competition agreements            
Estimated future amortization expense of intangible assets            
Finite-lived intangible assets 0us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
42,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
    42,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
 
Group of purchased intangible assets            
Identified intangible assets assumed in the acquisition of CRI            
Estimated Useful Life (in years)       7 years    
Other non-CRI related Patents            
Purchased patents            
Patents Acquired   2,500,000us-gaap_FinitelivedIntangibleAssetsAcquired1
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= rmbs_OtherPatentsMember
1,700,000us-gaap_FinitelivedIntangibleAssetsAcquired1
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= rmbs_OtherPatentsMember
     
LDT            
Identified intangible assets assumed in the acquisition of CRI            
Impairment charge         $ 4,000,000us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ us-gaap_StatementBusinessSegmentsAxis
= rmbs_LightingAndDisplayTechnologyLdtMember
$ 15,400,000us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ us-gaap_StatementBusinessSegmentsAxis
= rmbs_LightingAndDisplayTechnologyLdtMember