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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) (Convertible notes, 1.125% Convertible Senior Notes due 2018)
Dec. 31, 2014
Aug. 16, 2013
Convertible notes | 1.125% Convertible Senior Notes due 2018
   
Stated Interest rate (as a percent) 1.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
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= rmbs_SeniorOnePointOneTwoFivePercentConvertibleNotesDueTwoThousandEighteenMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember
1.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= rmbs_SeniorOnePointOneTwoFivePercentConvertibleNotesDueTwoThousandEighteenMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember