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Agreement with SK hynix (Details 4) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Jun. 11, 2013 | Dec. 09, 2013
SK hynix |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Cash Received | $ 48.0 us-gaap_ProceedsFromLegalSettlements / rmbs_AgreementNameAxis = rmbs_SKHynixMember | $ 24.0 us-gaap_ProceedsFromLegalSettlements / rmbs_AgreementNameAxis = rmbs_SKHynixMember |  |
Settlement Agreement, Future Recivables, Due in First Full Fiscal Year | 48.0 rmbs_SettlementAgreementFutureRecivablesDueinFirstFullFiscalYear / rmbs_AgreementNameAxis = rmbs_SKHynixMember |  |  |
Estimated to Be Received in 2016 | 48.0 rmbs_SettlementAgreementFutureRecivablesDueinSecondFullFiscalYear / rmbs_AgreementNameAxis = rmbs_SKHynixMember |  |  |
Estimated to Be Received in 2017 | 48.0 rmbs_SettlementAgreementFutureRecivablesDueinThirdFiscalYear / rmbs_AgreementNameAxis = rmbs_SKHynixMember |  |  |
Estimated to Be Received in 2018 | 24.0 rmbs_SettlementAgreementFutureRecivablesDueinFouthFullFiscalYear / rmbs_AgreementNameAxis = rmbs_SKHynixMember |  |  |
Total Estimated Cash receipts | 240.0 rmbs_SettlementAgreementConsideration / rmbs_AgreementNameAxis = rmbs_SKHynixMember |  | 240.0 rmbs_SettlementAgreementConsideration / rmbs_AgreementNameAxis = rmbs_SKHynixMember |
SK hynix | Royalty revenue |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Cash Received | 47.3 us-gaap_ProceedsFromLegalSettlements / rmbs_AgreementNameAxis = rmbs_SKHynixMember / us-gaap_IncomeStatementLocationAxis = us-gaap_RoyaltyArrangementMember | 23.6 us-gaap_ProceedsFromLegalSettlements / rmbs_AgreementNameAxis = rmbs_SKHynixMember / us-gaap_IncomeStatementLocationAxis = us-gaap_RoyaltyArrangementMember |  |
Settlement Agreement, Future Recivables, Due in First Full Fiscal Year | 47.3 rmbs_SettlementAgreementFutureRecivablesDueinFirstFullFiscalYear / rmbs_AgreementNameAxis = rmbs_SKHynixMember / us-gaap_IncomeStatementLocationAxis = us-gaap_RoyaltyArrangementMember |  |  |
Estimated to Be Received in 2016 | 47.9 rmbs_SettlementAgreementFutureRecivablesDueinSecondFullFiscalYear / rmbs_AgreementNameAxis = rmbs_SKHynixMember / us-gaap_IncomeStatementLocationAxis = us-gaap_RoyaltyArrangementMember |  |  |
Estimated to Be Received in 2017 | 48.0 rmbs_SettlementAgreementFutureRecivablesDueinThirdFiscalYear / rmbs_AgreementNameAxis = rmbs_SKHynixMember / us-gaap_IncomeStatementLocationAxis = us-gaap_RoyaltyArrangementMember |  |  |
Estimated to Be Received in 2018 | 24.0 rmbs_SettlementAgreementFutureRecivablesDueinFouthFullFiscalYear / rmbs_AgreementNameAxis = rmbs_SKHynixMember / us-gaap_IncomeStatementLocationAxis = us-gaap_RoyaltyArrangementMember |  |  |
Total Estimated Cash receipts | 238.1 rmbs_SettlementAgreementConsideration / rmbs_AgreementNameAxis = rmbs_SKHynixMember / us-gaap_IncomeStatementLocationAxis = us-gaap_RoyaltyArrangementMember |  | 238.1 rmbs_SettlementAgreementConsideration / rmbs_AgreementNameAxis = rmbs_SKHynixMember / us-gaap_IncomeStatementLocationAxis = us-gaap_RoyaltyArrangementMember |
SK hynix | Gain from settlement |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Cash Received | 0.7 us-gaap_ProceedsFromLegalSettlements / rmbs_AgreementNameAxis = rmbs_SKHynixMember / us-gaap_IncomeStatementLocationAxis = rmbs_GainFromSettlementMember | 0.4 us-gaap_ProceedsFromLegalSettlements / rmbs_AgreementNameAxis = rmbs_SKHynixMember / us-gaap_IncomeStatementLocationAxis = rmbs_GainFromSettlementMember |  |
Settlement Agreement, Future Recivables, Due in First Full Fiscal Year | 0.7 rmbs_SettlementAgreementFutureRecivablesDueinFirstFullFiscalYear / rmbs_AgreementNameAxis = rmbs_SKHynixMember / us-gaap_IncomeStatementLocationAxis = rmbs_GainFromSettlementMember |  |  |
Estimated to Be Received in 2016 | 0.1 rmbs_SettlementAgreementFutureRecivablesDueinSecondFullFiscalYear / rmbs_AgreementNameAxis = rmbs_SKHynixMember / us-gaap_IncomeStatementLocationAxis = rmbs_GainFromSettlementMember |  |  |
Estimated to Be Received in 2017 | 0 rmbs_SettlementAgreementFutureRecivablesDueinThirdFiscalYear / rmbs_AgreementNameAxis = rmbs_SKHynixMember / us-gaap_IncomeStatementLocationAxis = rmbs_GainFromSettlementMember |  |  |
Estimated to Be Received in 2018 | 0 rmbs_SettlementAgreementFutureRecivablesDueinFouthFullFiscalYear / rmbs_AgreementNameAxis = rmbs_SKHynixMember / us-gaap_IncomeStatementLocationAxis = rmbs_GainFromSettlementMember |  |  |
Total Estimated Cash receipts | 1.9 rmbs_SettlementAgreementConsideration / rmbs_AgreementNameAxis = rmbs_SKHynixMember / us-gaap_IncomeStatementLocationAxis = rmbs_GainFromSettlementMember |  |  |
Micron |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Cash Received | 40.0 us-gaap_ProceedsFromLegalSettlements / rmbs_AgreementNameAxis = rmbs_MicronAgreementMember | 5.5 us-gaap_ProceedsFromLegalSettlements / rmbs_AgreementNameAxis = rmbs_MicronAgreementMember |  |
Settlement Agreement, Future Recivables, Due in First Full Fiscal Year | 40.0 rmbs_SettlementAgreementFutureRecivablesDueinFirstFullFiscalYear / rmbs_AgreementNameAxis = rmbs_MicronAgreementMember |  |  |
Estimated to Be Received in 2016 | 40.0 rmbs_SettlementAgreementFutureRecivablesDueinSecondFullFiscalYear / rmbs_AgreementNameAxis = rmbs_MicronAgreementMember |  |  |
Estimated to Be Received in 2017 | 40.0 rmbs_SettlementAgreementFutureRecivablesDueinThirdFiscalYear / rmbs_AgreementNameAxis = rmbs_MicronAgreementMember |  |  |
Estimated to Be Received in 2018 | 40.0 rmbs_SettlementAgreementFutureRecivablesDueinFouthFullFiscalYear / rmbs_AgreementNameAxis = rmbs_MicronAgreementMember |  |  |
Estimated to Be Received in 2019 and thereafter | 74.5 rmbs_SettlementAgreementFutureReceivablesDueInFifthFullFiscalYearAndThereafter / rmbs_AgreementNameAxis = rmbs_MicronAgreementMember |  |  |
Total Estimated Cash receipts | 280.0 rmbs_SettlementAgreementConsideration / rmbs_AgreementNameAxis = rmbs_MicronAgreementMember |  |  | 280.0 rmbs_SettlementAgreementConsideration / rmbs_AgreementNameAxis = rmbs_MicronAgreementMember
Micron | Royalty revenue |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Cash Received | 38.7 us-gaap_ProceedsFromLegalSettlements / rmbs_AgreementNameAxis = rmbs_MicronAgreementMember / us-gaap_IncomeStatementLocationAxis = us-gaap_RoyaltyArrangementMember | 5.3 us-gaap_ProceedsFromLegalSettlements / rmbs_AgreementNameAxis = rmbs_MicronAgreementMember / us-gaap_IncomeStatementLocationAxis = us-gaap_RoyaltyArrangementMember |  |
Settlement Agreement, Future Recivables, Due in First Full Fiscal Year | 38.7 rmbs_SettlementAgreementFutureRecivablesDueinFirstFullFiscalYear / rmbs_AgreementNameAxis = rmbs_MicronAgreementMember / us-gaap_IncomeStatementLocationAxis = us-gaap_RoyaltyArrangementMember |  |  |
Estimated to Be Received in 2016 | 39.5 rmbs_SettlementAgreementFutureRecivablesDueinSecondFullFiscalYear / rmbs_AgreementNameAxis = rmbs_MicronAgreementMember / us-gaap_IncomeStatementLocationAxis = us-gaap_RoyaltyArrangementMember |  |  |
Estimated to Be Received in 2017 | 40.0 rmbs_SettlementAgreementFutureRecivablesDueinThirdFiscalYear / rmbs_AgreementNameAxis = rmbs_MicronAgreementMember / us-gaap_IncomeStatementLocationAxis = us-gaap_RoyaltyArrangementMember |  |  |
Estimated to Be Received in 2018 | 40.0 rmbs_SettlementAgreementFutureRecivablesDueinFouthFullFiscalYear / rmbs_AgreementNameAxis = rmbs_MicronAgreementMember / us-gaap_IncomeStatementLocationAxis = us-gaap_RoyaltyArrangementMember |  |  |
Estimated to Be Received in 2019 and thereafter | 74.5 rmbs_SettlementAgreementFutureReceivablesDueInFifthFullFiscalYearAndThereafter / rmbs_AgreementNameAxis = rmbs_MicronAgreementMember / us-gaap_IncomeStatementLocationAxis = us-gaap_RoyaltyArrangementMember |  |  |
Total Estimated Cash receipts | 276.7 rmbs_SettlementAgreementConsideration / rmbs_AgreementNameAxis = rmbs_MicronAgreementMember / us-gaap_IncomeStatementLocationAxis = us-gaap_RoyaltyArrangementMember |  |  | 276.7 rmbs_SettlementAgreementConsideration / rmbs_AgreementNameAxis = rmbs_MicronAgreementMember / us-gaap_IncomeStatementLocationAxis = us-gaap_RoyaltyArrangementMember
Micron | Gain from settlement |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Cash Received | 1.3 us-gaap_ProceedsFromLegalSettlements / rmbs_AgreementNameAxis = rmbs_MicronAgreementMember / us-gaap_IncomeStatementLocationAxis = rmbs_GainFromSettlementMember | 0.2 us-gaap_ProceedsFromLegalSettlements / rmbs_AgreementNameAxis = rmbs_MicronAgreementMember / us-gaap_IncomeStatementLocationAxis = rmbs_GainFromSettlementMember |  |
Settlement Agreement, Future Recivables, Due in First Full Fiscal Year | 1.3 rmbs_SettlementAgreementFutureRecivablesDueinFirstFullFiscalYear / rmbs_AgreementNameAxis = rmbs_MicronAgreementMember / us-gaap_IncomeStatementLocationAxis = rmbs_GainFromSettlementMember |  |  |
Estimated to Be Received in 2016 | 0.5 rmbs_SettlementAgreementFutureRecivablesDueinSecondFullFiscalYear / rmbs_AgreementNameAxis = rmbs_MicronAgreementMember / us-gaap_IncomeStatementLocationAxis = rmbs_GainFromSettlementMember |  |  |
Estimated to Be Received in 2017 | 0 rmbs_SettlementAgreementFutureRecivablesDueinThirdFiscalYear / rmbs_AgreementNameAxis = rmbs_MicronAgreementMember / us-gaap_IncomeStatementLocationAxis = rmbs_GainFromSettlementMember |  |  |
Estimated to Be Received in 2018 | 0 rmbs_SettlementAgreementFutureRecivablesDueinFouthFullFiscalYear / rmbs_AgreementNameAxis = rmbs_MicronAgreementMember / us-gaap_IncomeStatementLocationAxis = rmbs_GainFromSettlementMember |  |  |
Estimated to Be Received in 2019 and thereafter | 0 rmbs_SettlementAgreementFutureReceivablesDueInFifthFullFiscalYearAndThereafter / rmbs_AgreementNameAxis = rmbs_MicronAgreementMember / us-gaap_IncomeStatementLocationAxis = rmbs_GainFromSettlementMember |  |  |
Total Estimated Cash receipts | $ 3.3 rmbs_SettlementAgreementConsideration / rmbs_AgreementNameAxis = rmbs_MicronAgreementMember / us-gaap_IncomeStatementLocationAxis = rmbs_GainFromSettlementMember |  |  |

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

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- Definition Settlement Agreement, Future Receivables, Due In Fifth Full Fiscal Year And Thereafter + References No definition available. + Details
Name: | rmbs_SettlementAgreementFutureReceivablesDueInFifthFullFiscalYearAndThereafter
Namespace Prefix: | rmbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Settlement Agreement, Future Recivables, Due within the first full fiscal year following the date of the most recent balance sheet. + References No definition available. + Details
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Namespace Prefix: | rmbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Settlement Agreement, Future Recivables, Due within the fourth full fiscal year following the date of the most recent balance sheet. + References No definition available. + Details
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Namespace Prefix: | rmbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Settlement Agreement, Future Recivables, Due within the second full fiscal year following the date of the most recent balance sheet. + References No definition available. + Details
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Namespace Prefix: | rmbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Settlement Agreement, Future Recivables, Due within the third full fiscal year following the date of the most recent balance sheet. + References No definition available. + Details
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Namespace Prefix: | rmbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Definition Cash received for the settlement of litigation during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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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: |