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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income before taxes      
Domestic $ 49,173us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic $ (12,535)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic $ (61,036)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
Foreign 1,077us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign 518us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign (56,849)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
Income (loss) before income taxes 50,250us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (12,017)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (117,885)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Federal:      
Current 19,386us-gaap_CurrentFederalTaxExpenseBenefit 19,319us-gaap_CurrentFederalTaxExpenseBenefit 15,048us-gaap_CurrentFederalTaxExpenseBenefit
Deferred 2,337us-gaap_DeferredFederalIncomeTaxExpenseBenefit 2,200us-gaap_DeferredFederalIncomeTaxExpenseBenefit 587us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State:      
Current 713us-gaap_CurrentStateAndLocalTaxExpenseBenefit 47us-gaap_CurrentStateAndLocalTaxExpenseBenefit (2,868)us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Deferred 0us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (501)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 2,934us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Foreign:      
Current 1,640us-gaap_CurrentForeignTaxExpenseBenefit 446us-gaap_CurrentForeignTaxExpenseBenefit 543us-gaap_CurrentForeignTaxExpenseBenefit
Deferred (27)us-gaap_DeferredForeignIncomeTaxExpenseBenefit 220us-gaap_DeferredForeignIncomeTaxExpenseBenefit 207us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Provision for (benefit from) income taxes 24,049us-gaap_IncomeTaxExpenseBenefit 21,731us-gaap_IncomeTaxExpenseBenefit 16,451us-gaap_IncomeTaxExpenseBenefit
Effective income tax rate reconciliation      
Expense (benefit) at U.S. federal statutory rate (as a percent) 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate (35.00%)us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate (35.00%)us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Expense (benefit) at state statutory rate (as a percent) 1.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes (3.30%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 0.10%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Withholding tax (as a percent) 38.60%rmbs_EffectiveIncomeTaxRateReconciliationWithholdingTax 160.40%rmbs_EffectiveIncomeTaxRateReconciliationWithholdingTax 13.30%rmbs_EffectiveIncomeTaxRateReconciliationWithholdingTax
Foreign rate differential (as a percent) 2.50%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential 4.10%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential 17.40%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
Research and development ("R&D") credit (as a percent) (6.10%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch (36.70%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch
Executive compensation (as a percent) 0.20%rmbs_EffectiveIncomeTaxRateReconciliationExecutiveCompensation 0.80%rmbs_EffectiveIncomeTaxRateReconciliationExecutiveCompensation 0.30%rmbs_EffectiveIncomeTaxRateReconciliationExecutiveCompensation
Non-deductible stock-based compensation (as a percent) 1.40%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost 2.50%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost 0.70%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost
Foreign tax credit (as a percent) (38.70%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsForeign (163.30%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsForeign (13.30%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsForeign
Capitalized merger and acquisition costs (as a percent) 0.00%rmbs_EffectiveIncomeTaxRateReconciliationCapitalizedMergerAndAcquisitionCosts 0.00%rmbs_EffectiveIncomeTaxRateReconciliationCapitalizedMergerAndAcquisitionCosts 0.30%rmbs_EffectiveIncomeTaxRateReconciliationCapitalizedMergerAndAcquisitionCosts
Other (as a percent) 0.60%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments (1.00%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments (2.20%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Valuation allowance (as a percent) 13.40%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance 252.30%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance 32.40%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Effective tax rate (as a percent) 47.90%us-gaap_EffectiveIncomeTaxRateContinuingOperations 180.80%us-gaap_EffectiveIncomeTaxRateContinuingOperations 14.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Components of net deferred tax assets      
Depreciation and amortization 29,099rmbs_DeferredTaxAssetsDepreciationAndAmortization 28,093rmbs_DeferredTaxAssetsDepreciationAndAmortization  
Other liabilities and reserves 9,916us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther 18,578us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther  
Deferred equity compensation 29,511us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 33,837us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost  
Net operating loss carryovers 12,307us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 27,752us-gaap_DeferredTaxAssetsOperatingLossCarryforwards  
Tax credits 116,658us-gaap_DeferredTaxAssetsTaxCreditCarryforwards 100,052us-gaap_DeferredTaxAssetsTaxCreditCarryforwards  
Total gross deferred tax assets 197,491us-gaap_DeferredTaxAssetsGross 208,312us-gaap_DeferredTaxAssetsGross  
Convertible debt (8,092)rmbs_DeferredTaxLiabilitiesConvertibleDebt (13,000)rmbs_DeferredTaxLiabilitiesConvertibleDebt  
Total net deferred tax assets 189,399rmbs_DeferredTaxAssetsNetBeforeDeductingValuationAllowance 195,312rmbs_DeferredTaxAssetsNetBeforeDeductingValuationAllowance  
Valuation allowance (193,874)us-gaap_DeferredTaxAssetsValuationAllowance (192,823)us-gaap_DeferredTaxAssetsValuationAllowance  
Net deferred tax assets (4,475)us-gaap_DeferredTaxAssetsLiabilitiesNet 2,489us-gaap_DeferredTaxAssetsLiabilitiesNet  
Net deferred tax assets reported as:      
Current deferred tax assets 187us-gaap_DeferredTaxAssetsNetCurrent 205us-gaap_DeferredTaxAssetsNetCurrent  
Deferred Tax Liabilities, Net (1,131)us-gaap_DeferredTaxLiabilitiesCurrent (791)us-gaap_DeferredTaxLiabilitiesCurrent  
Non-current deferred tax assets 536us-gaap_DeferredTaxAssetsNetNoncurrent 4,797us-gaap_DeferredTaxAssetsNetNoncurrent  
Non-current deferred tax liabilities (4,067)us-gaap_DeferredTaxLiabilitiesNoncurrent (1,722)us-gaap_DeferredTaxLiabilitiesNoncurrent  
Net deferred tax assets $ (4,475)us-gaap_DeferredTaxAssetsLiabilitiesNet $ 2,489us-gaap_DeferredTaxAssetsLiabilitiesNet