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CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Revenue:      
Royalties $ 271,521us-gaap_RoyaltyRevenue $ 264,111us-gaap_RoyaltyRevenue $ 232,385us-gaap_RoyaltyRevenue
Contract and other revenue 25,037us-gaap_ContractsRevenue 7,390us-gaap_ContractsRevenue 1,666us-gaap_ContractsRevenue
Total revenue 296,558us-gaap_SalesRevenueNet 271,501us-gaap_SalesRevenueNet 234,051us-gaap_SalesRevenueNet
Operating costs and expenses:      
Cost of revenue 41,947us-gaap_CostOfRevenue [1] 33,215us-gaap_CostOfRevenue [1] 28,372us-gaap_CostOfRevenue [1]
Research and development 110,025us-gaap_ResearchAndDevelopmentExpense [1] 117,981us-gaap_ResearchAndDevelopmentExpense [1] 140,503us-gaap_ResearchAndDevelopmentExpense [1]
Sales, general and administrative 74,770us-gaap_SellingGeneralAndAdministrativeExpense [1] 76,467us-gaap_SellingGeneralAndAdministrativeExpense [1] 112,838us-gaap_SellingGeneralAndAdministrativeExpense [1]
Restructuring costs 39us-gaap_RestructuringCharges 5,546us-gaap_RestructuringCharges 7,301us-gaap_RestructuringCharges
Impairment of goodwill and long-lived assets 0rmbs_ImpairmentOfGoodwillAndLongLivedAssets 17,751rmbs_ImpairmentOfGoodwillAndLongLivedAssets 35,471rmbs_ImpairmentOfGoodwillAndLongLivedAssets
Gain from sale of intellectual property (3,529)us-gaap_GainLossOnDispositionOfIntangibleAssets (1,388)us-gaap_GainLossOnDispositionOfIntangibleAssets 0us-gaap_GainLossOnDispositionOfIntangibleAssets
Gain from settlement (2,040)us-gaap_GainLossRelatedToLitigationSettlement (535)us-gaap_GainLossRelatedToLitigationSettlement 0us-gaap_GainLossRelatedToLitigationSettlement
Costs and Expenses 221,212us-gaap_CostsAndExpenses 249,037us-gaap_CostsAndExpenses 324,485us-gaap_CostsAndExpenses
Operating income (loss) 75,346us-gaap_OperatingIncomeLoss 22,464us-gaap_OperatingIncomeLoss (90,434)us-gaap_OperatingIncomeLoss
Interest income and other income (expense), net (276)us-gaap_OtherNonoperatingIncome (1,596)us-gaap_OtherNonoperatingIncome 59us-gaap_OtherNonoperatingIncome
Interest expense (24,820)us-gaap_InterestExpense (32,885)us-gaap_InterestExpense (27,510)us-gaap_InterestExpense
Interest and other income (expense), net (25,096)us-gaap_NonoperatingIncomeExpense (34,481)us-gaap_NonoperatingIncomeExpense (27,451)us-gaap_NonoperatingIncomeExpense
Income (loss) before income taxes 50,250us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (12,017)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (117,885)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Provision for income taxes 24,049us-gaap_IncomeTaxExpenseBenefit 21,731us-gaap_IncomeTaxExpenseBenefit 16,451us-gaap_IncomeTaxExpenseBenefit
Net income (loss) $ 26,201us-gaap_NetIncomeLoss $ (33,748)us-gaap_NetIncomeLoss $ (134,336)us-gaap_NetIncomeLoss
Net income (loss) per share:      
Basic (in dollars per share) $ 0.23us-gaap_EarningsPerShareBasicUndistributed $ (0.30)us-gaap_EarningsPerShareBasicUndistributed $ (1.21)us-gaap_EarningsPerShareBasicUndistributed
Diluted (in dollars per share) $ 0.22us-gaap_EarningsPerShareDilutedUndistributed $ (0.30)us-gaap_EarningsPerShareDilutedUndistributed $ (1.21)us-gaap_EarningsPerShareDilutedUndistributed
Weighted average shares used in per share calculations:      
Basic (in shares) 114,318us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 112,415us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 110,769us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (in shares) 117,624us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 112,415us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 110,769us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
[1] * Includes stock-based compensation: Cost of revenue$44 $19 $20Research and development$7,216 $6,597 $9,546Sales, general and administrative$7,470 $8,365 $12,980