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Commitments and Contingencies (Details) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Contractual obligations      
Remainder of 2015 $ 15,330,000us-gaap_ContractualObligationFutureMinimumPaymentsDueRemainderOfFiscalYear [1]    
2016 11,491,000us-gaap_ContractualObligationDueInNextTwelveMonths [1]    
2017 9,193,000us-gaap_ContractualObligationDueInSecondYear [1]    
2018 146,339,000us-gaap_ContractualObligationDueInThirdYear [1]    
2019 6,602,000us-gaap_ContractualObligationDueInFourthYear [1]    
Thereafter 2,869,000rmbs_ContractualObligationPaymentsDueAfterFourthFullFiscalYear [1]    
Contractual Obligation 191,824,000us-gaap_ContractualObligation [1]    
Unrecognized tax benefits 21,400,000us-gaap_UnrecognizedTaxBenefits   19,900,000us-gaap_UnrecognizedTaxBenefits
Unrecognized tax benefits, reduction of long-term deferred tax assets 18,400,000rmbs_UnrecognizedTaxBenefitsDeferredTaxAssetsNoncurrentGross   17,800,000rmbs_UnrecognizedTaxBenefitsDeferredTaxAssetsNoncurrentGross
Unrecognized tax benefits included in long-term income taxes payable 3,000,000rmbs_UnrecognizedTaxBenefitsAccruedIncomeTaxesNoncurrent   2,100,000rmbs_UnrecognizedTaxBenefitsAccruedIncomeTaxesNoncurrent
Terms of noncancellable license agreement, minimum (in years) 1 year    
Rent expense 700,000us-gaap_LeaseAndRentalExpense 600,000us-gaap_LeaseAndRentalExpense  
Deferred rent 1,000,000us-gaap_DeferredRentCreditNoncurrent   1,100,000us-gaap_DeferredRentCreditNoncurrent
Imputed financing obligation      
Contractual obligations      
Remainder of 2015 4,525,000us-gaap_ContractualObligationFutureMinimumPaymentsDueRemainderOfFiscalYear
/ rmbs_ContractualObligationAxis
= rmbs_ImputedFinancingObligationMember		 [1],[2]    
2016 6,156,000us-gaap_ContractualObligationDueInNextTwelveMonths
/ rmbs_ContractualObligationAxis
= rmbs_ImputedFinancingObligationMember		 [1],[2]    
2017 6,302,000us-gaap_ContractualObligationDueInSecondYear
/ rmbs_ContractualObligationAxis
= rmbs_ImputedFinancingObligationMember		 [1],[2]    
2018 6,447,000us-gaap_ContractualObligationDueInThirdYear
/ rmbs_ContractualObligationAxis
= rmbs_ImputedFinancingObligationMember		 [1],[2]    
2019 6,602,000us-gaap_ContractualObligationDueInFourthYear
/ rmbs_ContractualObligationAxis
= rmbs_ImputedFinancingObligationMember		 [1],[2]    
Thereafter 2,869,000rmbs_ContractualObligationPaymentsDueAfterFourthFullFiscalYear
/ rmbs_ContractualObligationAxis
= rmbs_ImputedFinancingObligationMember		 [1],[2]    
Contractual Obligation 32,901,000us-gaap_ContractualObligation
/ rmbs_ContractualObligationAxis
= rmbs_ImputedFinancingObligationMember		 [1],[2]    
Leases and other contractual obligations      
Contractual obligations      
Remainder of 2015 3,809,000us-gaap_ContractualObligationFutureMinimumPaymentsDueRemainderOfFiscalYear
/ rmbs_ContractualObligationAxis
= us-gaap_LeasesAcquiredInPlaceMember		 [1]    
2016 2,034,000us-gaap_ContractualObligationDueInNextTwelveMonths
/ rmbs_ContractualObligationAxis
= us-gaap_LeasesAcquiredInPlaceMember		 [1]    
2017 1,338,000us-gaap_ContractualObligationDueInSecondYear
/ rmbs_ContractualObligationAxis
= us-gaap_LeasesAcquiredInPlaceMember		 [1]    
2018 340,000us-gaap_ContractualObligationDueInThirdYear
/ rmbs_ContractualObligationAxis
= us-gaap_LeasesAcquiredInPlaceMember		 [1]    
2019 0us-gaap_ContractualObligationDueInFourthYear
/ rmbs_ContractualObligationAxis
= us-gaap_LeasesAcquiredInPlaceMember		 [1]    
Thereafter 0rmbs_ContractualObligationPaymentsDueAfterFourthFullFiscalYear
/ rmbs_ContractualObligationAxis
= us-gaap_LeasesAcquiredInPlaceMember		 [1]    
Contractual Obligation 7,521,000us-gaap_ContractualObligation
/ rmbs_ContractualObligationAxis
= us-gaap_LeasesAcquiredInPlaceMember		 [1]    
Software licenses      
Contractual obligations      
Remainder of 2015 6,220,000us-gaap_ContractualObligationFutureMinimumPaymentsDueRemainderOfFiscalYear
/ rmbs_ContractualObligationAxis
= us-gaap_SoftwareLicenseArrangementMember		 [1],[3]    
2016 1,748,000us-gaap_ContractualObligationDueInNextTwelveMonths
/ rmbs_ContractualObligationAxis
= us-gaap_SoftwareLicenseArrangementMember		 [1],[3]    
2017 0us-gaap_ContractualObligationDueInSecondYear
/ rmbs_ContractualObligationAxis
= us-gaap_SoftwareLicenseArrangementMember		 [1],[3]    
2018 0us-gaap_ContractualObligationDueInThirdYear
/ rmbs_ContractualObligationAxis
= us-gaap_SoftwareLicenseArrangementMember		 [1],[3]    
2019 0us-gaap_ContractualObligationDueInFourthYear
/ rmbs_ContractualObligationAxis
= us-gaap_SoftwareLicenseArrangementMember		 [1],[3]    
Thereafter 0rmbs_ContractualObligationPaymentsDueAfterFourthFullFiscalYear
/ rmbs_ContractualObligationAxis
= us-gaap_SoftwareLicenseArrangementMember		 [1],[3]    
Contractual Obligation 7,968,000us-gaap_ContractualObligation
/ rmbs_ContractualObligationAxis
= us-gaap_SoftwareLicenseArrangementMember		 [1],[3]    
Convertible notes      
Contractual obligations      
Remainder of 2015 0us-gaap_ContractualObligationFutureMinimumPaymentsDueRemainderOfFiscalYear
/ rmbs_ContractualObligationAxis
= us-gaap_ConvertibleNotesPayableMember		 [1]    
2016 0us-gaap_ContractualObligationDueInNextTwelveMonths
/ rmbs_ContractualObligationAxis
= us-gaap_ConvertibleNotesPayableMember		 [1]    
2017 0us-gaap_ContractualObligationDueInSecondYear
/ rmbs_ContractualObligationAxis
= us-gaap_ConvertibleNotesPayableMember		 [1]    
2018 138,000,000us-gaap_ContractualObligationDueInThirdYear
/ rmbs_ContractualObligationAxis
= us-gaap_ConvertibleNotesPayableMember		 [1]    
2019 0us-gaap_ContractualObligationDueInFourthYear
/ rmbs_ContractualObligationAxis
= us-gaap_ConvertibleNotesPayableMember		 [1]    
Thereafter 0rmbs_ContractualObligationPaymentsDueAfterFourthFullFiscalYear
/ rmbs_ContractualObligationAxis
= us-gaap_ConvertibleNotesPayableMember		 [1]    
Contractual Obligation 138,000,000us-gaap_ContractualObligation
/ rmbs_ContractualObligationAxis
= us-gaap_ConvertibleNotesPayableMember		 [1]    
Interest payments related to convertible notes      
Contractual obligations      
Remainder of 2015 776,000us-gaap_ContractualObligationFutureMinimumPaymentsDueRemainderOfFiscalYear
/ rmbs_ContractualObligationAxis
= rmbs_InterestPaymentRelatedToConvertibleNotesMember		 [1]    
2016 1,553,000us-gaap_ContractualObligationDueInNextTwelveMonths
/ rmbs_ContractualObligationAxis
= rmbs_InterestPaymentRelatedToConvertibleNotesMember		 [1]    
2017 1,553,000us-gaap_ContractualObligationDueInSecondYear
/ rmbs_ContractualObligationAxis
= rmbs_InterestPaymentRelatedToConvertibleNotesMember		 [1]    
2018 1,552,000us-gaap_ContractualObligationDueInThirdYear
/ rmbs_ContractualObligationAxis
= rmbs_InterestPaymentRelatedToConvertibleNotesMember		 [1]    
2019 0us-gaap_ContractualObligationDueInFourthYear
/ rmbs_ContractualObligationAxis
= rmbs_InterestPaymentRelatedToConvertibleNotesMember		 [1]    
Thereafter 0rmbs_ContractualObligationPaymentsDueAfterFourthFullFiscalYear
/ rmbs_ContractualObligationAxis
= rmbs_InterestPaymentRelatedToConvertibleNotesMember		 [1]    
Contractual Obligation $ 5,434,000us-gaap_ContractualObligation
/ rmbs_ContractualObligationAxis
= rmbs_InterestPaymentRelatedToConvertibleNotesMember		 [1]    
[1] The above table does not reflect possible payments in connection with uncertain tax benefits of approximately $21.4 million including $18.4 million recorded as a reduction of long-term deferred tax assets and $3.0 million in long-term income taxes payable as of March 31, 2015. As noted below in Note 12, “Income Taxes,” although it is possible that some of the unrecognized tax benefits could be settled within the next 12 months, the Company cannot reasonably estimate the outcome at this time.
[2] With respect to the imputed financing obligation, the main components of the difference between the amount reflected in the contractual obligations table and the amount reflected on the condensed consolidated balance sheets are the interest on the imputed financing obligation and the estimated common area expenses over the future periods. The amount includes the amended Ohio lease and the amended Sunnyvale lease.
[3] The Company has commitments with various software vendors for non-cancellable agreements generally having terms longer than one year.