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Agreement with SK hynix (Details) (USD $)
In Millions, unless otherwise specified
 0 Months Ended 1 Months Ended 0 Months Ended
Jun. 11, 2013
May 31, 2013
Dec. 09, 2013
Dec. 31, 2014
SK hynix        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Term of patent license agreement 5 years      
Amount to be paid quarterly       $ 12.0rmbs_LicenseAgreementFixedAmounttobePaidQuarterly
/ rmbs_AgreementNameAxis
= rmbs_SKHynixMember
Future Receivables       168.0rmbs_SettlementAgreementFutureReceivables
/ rmbs_AgreementNameAxis
= rmbs_SKHynixMember
Credit against settlement award   250.0rmbs_CreditAgainstCourtReward
/ rmbs_AgreementNameAxis
= rmbs_SKHynixMember		    
Micron        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Term of patent license agreement     7 years  
Amount to be paid quarterly       10.0rmbs_LicenseAgreementFixedAmounttobePaidQuarterly
/ rmbs_AgreementNameAxis
= rmbs_MicronAgreementMember
Future Receivables       $ 234.5rmbs_SettlementAgreementFutureReceivables
/ rmbs_AgreementNameAxis
= rmbs_MicronAgreementMember