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Agreements with SK hynix and Micron (Details) (USD $)
In Millions, unless otherwise specified
 0 Months Ended
Jun. 11, 2013
Dec. 09, 2013
Mar. 31, 2015
SK hynix [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
License Agreement, Term of Agreement 5 years    
Amount to be paid quarterly     $ 12.0rmbs_LicenseAgreementFixedAmounttobePaidQuarterly
/ rmbs_AgreementNameAxis
= rmbs_SKHynixMember
Future Receivables     156.0rmbs_SettlementAgreementFutureReceivables
/ rmbs_AgreementNameAxis
= rmbs_SKHynixMember
Micron [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
License Agreement, Term of Agreement   7 years  
Amount to be paid quarterly     10.0rmbs_LicenseAgreementFixedAmounttobePaidQuarterly
/ rmbs_AgreementNameAxis
= rmbs_MicronMember
Future Receivables     $ 224.5rmbs_SettlementAgreementFutureReceivables
/ rmbs_AgreementNameAxis
= rmbs_MicronMember