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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
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SK hynix |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Antitrust litigation settlement |  | $ 1.9 rmbs_SettlementAgreementAllocatedConsiderationAntitrustLitigationSettlement / rmbs_AgreementNameAxis = rmbs_SKHynixMember |
Settlement of past infringement |  | 125.8 rmbs_SettlementAgreementAllocatedConsiderationSettlementOfPastInfringement / rmbs_AgreementNameAxis = rmbs_SKHynixMember |
License agreement |  | 112.3 rmbs_SettlementAgreementAllocatedConsiderationLicenseAgreement / rmbs_AgreementNameAxis = rmbs_SKHynixMember |
Total consideration | 240.0 rmbs_SettlementAgreementConsideration / rmbs_AgreementNameAxis = rmbs_SKHynixMember | 240.0 rmbs_SettlementAgreementConsideration / rmbs_AgreementNameAxis = rmbs_SKHynixMember |
Micron |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Antitrust litigation settlement |  |  | 3.3 rmbs_SettlementAgreementAllocatedConsiderationAntitrustLitigationSettlement / rmbs_AgreementNameAxis = rmbs_MicronAgreementMember
Settlement of past infringement |  |  | 96.3 rmbs_SettlementAgreementAllocatedConsiderationSettlementOfPastInfringement / rmbs_AgreementNameAxis = rmbs_MicronAgreementMember
License agreement |  |  | 180.4 rmbs_SettlementAgreementAllocatedConsiderationLicenseAgreement / rmbs_AgreementNameAxis = rmbs_MicronAgreementMember
Total consideration | $ 280.0 rmbs_SettlementAgreementConsideration / rmbs_AgreementNameAxis = rmbs_MicronAgreementMember |  | $ 280.0 rmbs_SettlementAgreementConsideration / rmbs_AgreementNameAxis = rmbs_MicronAgreementMember

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- Definition Settlement Agreement, Allocated Consideration, Antitrust Litigation Settlement + References No definition available. + Details
Name: | rmbs_SettlementAgreementAllocatedConsiderationAntitrustLitigationSettlement
Namespace Prefix: | rmbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Settlement Agreement, Allocated Consideration, License Agreement + References No definition available. + Details
Name: | rmbs_SettlementAgreementAllocatedConsiderationLicenseAgreement
Namespace Prefix: | rmbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Settlement Agreement, Allocated Consideration, Settlement Of Past Infringement + References No definition available. + Details
Name: | rmbs_SettlementAgreementAllocatedConsiderationSettlementOfPastInfringement
Namespace Prefix: | rmbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Settlement Agreement, Consideration + References No definition available. + Details
Name: | rmbs_SettlementAgreementConsideration
Namespace Prefix: | rmbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | rmbs_AgreementNameAxis=rmbs_MicronAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | rmbs_AgreementNameAxis=rmbs_SKHynixMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |