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Commitments and Contingencies (Details) (USD $) | 3 Months Ended | 12 Months Ended | 0 Months Ended | 3 Months Ended | 0 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jun. 29, 2009 | Aug. 16, 2013 | Dec. 15, 2009 sqft | Sep. 30, 2011 | Feb. 01, 2012 | Jul. 10, 2009 | Jan. 31, 2013 sqft | Nov. 04, 2011 sqft | Sep. 29, 2012 | Sep. 29, 2011 sqft | Mar. 08, 2010 sqft
Lease Commitments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense related to imputed financing obligation |  |  |  | $ 4,500,000 rmbs_FinancingExpenseFromLeaseFacilities | $ 4,400,000 rmbs_FinancingExpenseFromLeaseFacilities | $ 4,100,000 rmbs_FinancingExpenseFromLeaseFacilities |  |  |  |  |  |  |  |  |  |  |
Current and Long Term, Imputed Financing Obligation | 39,700,000 rmbs_CurrentAndLongTermImputedFinancingObligation |  |  | 39,500,000 rmbs_CurrentAndLongTermImputedFinancingObligation | 39,700,000 rmbs_CurrentAndLongTermImputedFinancingObligation |  |  |  |  |  |  |  |  |  |  |  |
Capitalized property plant and equipment | 40,320,000 rmbs_PropertyPlantAndEquipmentCostCapitalizationAmount |  |  | 40,300,000 rmbs_PropertyPlantAndEquipmentCostCapitalizationAmount | 40,320,000 rmbs_PropertyPlantAndEquipmentCostCapitalizationAmount |  |  |  |  |  |  |  |  |  |  |  |
Restructuring charges | 2,200,000 us-gaap_RestructuringCharges | 1,100,000 us-gaap_RestructuringCharges | 2,200,000 us-gaap_RestructuringCharges | 39,000 us-gaap_RestructuringCharges | 5,546,000 us-gaap_RestructuringCharges | 7,301,000 us-gaap_RestructuringCharges |  |  |  |  |  |  |  |  |  |  |
Unamortized discount | 36,824,000 us-gaap_DebtInstrumentUnamortizedDiscount |  |  | 22,911,000 us-gaap_DebtInstrumentUnamortizedDiscount | 36,824,000 us-gaap_DebtInstrumentUnamortizedDiscount |  |  |  |  |  |  |  |  |  |  |  |
Convertible notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease Commitments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face Value | 310,500,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember |  |  | 138,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember | 310,500,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember |  |  |  |  |  |  |  |  |  |  |  |
Convertible notes | 5% Convertible Senior Notes due 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease Commitments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face Value | 172,500,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = rmbs_Senior5PercentConvertibleNotesDue2014Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember |  |  | 0 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = rmbs_Senior5PercentConvertibleNotesDue2014Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember | 172,500,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = rmbs_Senior5PercentConvertibleNotesDue2014Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember |  | 150,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = rmbs_Senior5PercentConvertibleNotesDue2014Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember |  |  |  |  | 22,500,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = rmbs_Senior5PercentConvertibleNotesDue2014Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember |  |  |  |  |
Unamortized discount | 8,453,000 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = rmbs_Senior5PercentConvertibleNotesDue2014Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember |  |  | 0 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = rmbs_Senior5PercentConvertibleNotesDue2014Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember | 8,453,000 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = rmbs_Senior5PercentConvertibleNotesDue2014Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember |  |  |  |  |  |  |  |  |  |  |  |
Debt discount amortization period |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |
Convertible notes | 1.125% Convertible Senior Notes due 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease Commitments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face Value | 138,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = rmbs_SeniorOnePointOneTwoFivePercentConvertibleNotesDueTwoThousandEighteenMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember |  |  | 138,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = rmbs_SeniorOnePointOneTwoFivePercentConvertibleNotesDueTwoThousandEighteenMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember | 138,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = rmbs_SeniorOnePointOneTwoFivePercentConvertibleNotesDueTwoThousandEighteenMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember |  |  | 138,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = rmbs_SeniorOnePointOneTwoFivePercentConvertibleNotesDueTwoThousandEighteenMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember |  |  |  |  |  |  |  |  |
Unamortized discount | 28,371,000 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = rmbs_SeniorOnePointOneTwoFivePercentConvertibleNotesDueTwoThousandEighteenMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember |  |  | 22,911,000 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = rmbs_SeniorOnePointOneTwoFivePercentConvertibleNotesDueTwoThousandEighteenMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember | 28,371,000 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = rmbs_SeniorOnePointOneTwoFivePercentConvertibleNotesDueTwoThousandEighteenMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember |  |  |  |  |  |  |  |  |  |  |  |
Debt discount amortization period |  |  |  | 44 months |  |  |  | 5 years |  |  |  |  |  |  |  |  |
Convertible Senior Notes [Member] | 5% Convertible Senior Notes due 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease Commitments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Debt |  |  |  | 172,500,000 us-gaap_RepaymentsOfDebt / us-gaap_DebtInstrumentAxis = rmbs_Senior5PercentConvertibleNotesDue2014Member / us-gaap_LongtermDebtTypeAxis = rmbs_ConvertibleSeniorNotesMember |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Closing [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease Commitments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  | 2,000,000 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember |  |  |  |  |  |  |  |  |  |  |  |
Sunnyvale Facility, Original agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease Commitments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of options |  |  |  |  |  |  |  |  | 2 rmbs_OperatingLeaseCommitmentNumberOfOptionToExtendLeaseAgreement / rmbs_OperatingLeaseCommitmentAxis = rmbs_MtspellcMember |  |  |  |  |  |  |  |
Period for extension of lease (in months) |  |  |  |  |  |  |  |  | 60 months |  |  |  |  |  |  |  |
Total reimbursement receivable under lease agreement |  |  |  |  |  |  |  |  | 9,100,000 rmbs_ReimbursementUnderLeasesToBeReceived / rmbs_OperatingLeaseCommitmentAxis = rmbs_MtspellcMember |  |  |  |  |  |  |  |
Total space under lease (in square feet) |  |  |  |  |  |  |  |  | 125,000 us-gaap_AreaOfRealEstateProperty / rmbs_OperatingLeaseCommitmentAxis = rmbs_MtspellcMember |  |  |  |  |  |  |  |
Sunnyvale Facility, First Amended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease Commitments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total reimbursement receivable under lease agreement |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,700,000 rmbs_ReimbursementUnderLeasesToBeReceived / rmbs_OperatingLeaseCommitmentAxis = rmbs_MtspellcAmendedMember |  |  |
Total space under lease (in square feet) |  |  |  |  |  |  |  |  |  |  |  |  | 31,000 us-gaap_AreaOfRealEstateProperty / rmbs_OperatingLeaseCommitmentAxis = rmbs_MtspellcAmendedMember | 31,000 us-gaap_AreaOfRealEstateProperty / rmbs_OperatingLeaseCommitmentAxis = rmbs_MtspellcAmendedMember |  |  |
Sunnyvale Facility, Second Amended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease Commitments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total reimbursement receivable under lease agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,500,000 rmbs_ReimbursementUnderLeasesToBeReceived / rmbs_OperatingLeaseCommitmentAxis = rmbs_SunnyvaleFacilitySecondAmendedMember |  |
Ohio Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease Commitments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period for extension of lease (in months) |  |  |  |  |  |  |  |  |  | 60 months |  |  |  |  |  |  |
Total space under lease (in square feet) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 51,000 us-gaap_AreaOfRealEstateProperty / rmbs_OperatingLeaseCommitmentAxis = rmbs_OhioFacilityMember |
Fogg-Brecksville Development Co., Original |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease Commitments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total space under lease (in square feet) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,000 us-gaap_AreaOfRealEstateProperty / rmbs_OperatingLeaseCommitmentAxis = rmbs_FoggBrecksvilleDevelopmentMember
San Francisco Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease Commitments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease term (in months) |  |  |  |  |  |  |  |  |  |  | 75 months |  |  |  |  |  |
Total space under lease (in square feet) |  |  |  |  |  |  |  |  |  |  |  |  |  | 26,000 us-gaap_AreaOfRealEstateProperty / rmbs_OperatingLeaseCommitmentAxis = rmbs_MetropolitanLifeInsuranceMember |  |  |

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- Definition The unamortized amount of current and long-term liabilities that an Entity assumes in consideration for the estimated fair value of the Entity's share of buildings in the build out of leased facilities plus any tenant improvement allowance received from landlords. As the Entity retains sufficient continuing involvement following the completion of construction, for accounting purposes, the Entity is treated as the owner of the leased facilities and to record an imputed financing obligation for its obligation to the legal owners. + References No definition available. + Details
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