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Agreement with SK hynix (Details 3) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Jun. 11, 2013	Dec. 09, 2013
SK hynix
Accounts, Notes, Loans and Financing Receivable [Line Items]
Antitrust litigation settlement		$ 1.9rmbs_SettlementAgreementAllocatedConsiderationAntitrustLitigationSettlement / rmbs_AgreementNameAxis = rmbs_SKHynixMember
Settlement of past infringement		125.8rmbs_SettlementAgreementAllocatedConsiderationSettlementOfPastInfringement / rmbs_AgreementNameAxis = rmbs_SKHynixMember
License agreement		112.3rmbs_SettlementAgreementAllocatedConsiderationLicenseAgreement / rmbs_AgreementNameAxis = rmbs_SKHynixMember
Total consideration	240.0rmbs_SettlementAgreementConsideration / rmbs_AgreementNameAxis = rmbs_SKHynixMember	240.0rmbs_SettlementAgreementConsideration / rmbs_AgreementNameAxis = rmbs_SKHynixMember
Micron
Accounts, Notes, Loans and Financing Receivable [Line Items]
Antitrust litigation settlement			3.3rmbs_SettlementAgreementAllocatedConsiderationAntitrustLitigationSettlement / rmbs_AgreementNameAxis = rmbs_MicronAgreementMember
Settlement of past infringement			96.3rmbs_SettlementAgreementAllocatedConsiderationSettlementOfPastInfringement / rmbs_AgreementNameAxis = rmbs_MicronAgreementMember
License agreement			180.4rmbs_SettlementAgreementAllocatedConsiderationLicenseAgreement / rmbs_AgreementNameAxis = rmbs_MicronAgreementMember
Total consideration	$ 280.0rmbs_SettlementAgreementConsideration / rmbs_AgreementNameAxis = rmbs_MicronAgreementMember		$ 280.0rmbs_SettlementAgreementConsideration / rmbs_AgreementNameAxis = rmbs_MicronAgreementMember

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- Definition

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Settlement Agreement, Allocated Consideration, Settlement Of Past Infringement

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