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Earnings (Loss) Per Share (Details 2) (USD $) In Millions, except Per Share data, unless otherwise specified | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2014 | Jun. 29, 2009 | Aug. 16, 2013
Anti-dilutive shares excluded from calculation of earnings per share |  |  |  |  |
Dilutive Potential Securities Excluded from Computation of EPS Amount Due to Loss | 3.3 rmbs_DilutivePotentialSecuritiesExcludedfromComputationofEPSAmountDuetoLoss | 6.8 rmbs_DilutivePotentialSecuritiesExcludedfromComputationofEPSAmountDuetoLoss |  |  |
Options |  |  |  |  |
Anti-dilutive shares excluded from calculation of earnings per share |  |  |  |  |
Anti-dilutive shares excluded from calculation of earnings per share | 7.3 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember | 12.2 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember | 5.6 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember |  |
Convertible notes | 5% Convertible Senior Notes due 2014 |  |  |  |  |
Anti-dilutive shares excluded from calculation of earnings per share |  |  |  |  |
Stated Interest rate (as a percent) |  |  |  | 5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = rmbs_Senior5PercentConvertibleNotesDue2014Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember |
Initial conversion price of notes (in dollars per share) |  |  |  | $ 19.31 us-gaap_DebtInstrumentConvertibleConversionPrice1 / us-gaap_DebtInstrumentAxis = rmbs_Senior5PercentConvertibleNotesDue2014Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember |
Convertible notes | 1.125% Convertible Senior Notes due 2018 |  |  |  |  |
Anti-dilutive shares excluded from calculation of earnings per share |  |  |  |  |
Stated Interest rate (as a percent) |  |  | 1.125%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = rmbs_SeniorOnePointOneTwoFivePercentConvertibleNotesDueTwoThousandEighteenMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember |  | 1.125%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = rmbs_SeniorOnePointOneTwoFivePercentConvertibleNotesDueTwoThousandEighteenMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember
Initial conversion price of notes (in dollars per share) |  |  |  |  | $ 12.07 us-gaap_DebtInstrumentConvertibleConversionPrice1 / us-gaap_DebtInstrumentAxis = rmbs_SeniorOnePointOneTwoFivePercentConvertibleNotesDueTwoThousandEighteenMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember

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- Definition Dilutive potential shares excluded from calculation of EPS (in shares) due to the Company's loss position during the reporting period. (type: per Share) + References No definition available. + Details
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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 + Details
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- Definition The price per share of the conversion feature embedded in the debt instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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