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Fair Value of Financial Instruments (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Carrying Value	$ 115,089us-gaap_ConvertibleNotesPayable	$ 273,676us-gaap_ConvertibleNotesPayable
5% Convertible Senior Notes due 2014
Debt Instrument [Line Items]
Face Value	0us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = rmbs_Senior5PercentConvertibleNotesDue2014Member	172,500us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = rmbs_Senior5PercentConvertibleNotesDue2014Member
Carrying Value	0us-gaap_ConvertibleNotesPayable / us-gaap_LongtermDebtTypeAxis = rmbs_Senior5PercentConvertibleNotesDue2014Member	164,047us-gaap_ConvertibleNotesPayable / us-gaap_LongtermDebtTypeAxis = rmbs_Senior5PercentConvertibleNotesDue2014Member
Fair Value	0us-gaap_ConvertibleDebtFairValueDisclosures / us-gaap_LongtermDebtTypeAxis = rmbs_Senior5PercentConvertibleNotesDue2014Member	175,821us-gaap_ConvertibleDebtFairValueDisclosures / us-gaap_LongtermDebtTypeAxis = rmbs_Senior5PercentConvertibleNotesDue2014Member
Stated Interest rate (as a percent)	5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = rmbs_Senior5PercentConvertibleNotesDue2014Member	5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = rmbs_Senior5PercentConvertibleNotesDue2014Member
1.125% Convertible Senior Notes due 2018
Debt Instrument [Line Items]
Face Value	138,000us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = rmbs_SeniorOnePointOneTwoFivePercentConvertibleNotesDueTwoThousandEighteenMember	138,000us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = rmbs_SeniorOnePointOneTwoFivePercentConvertibleNotesDueTwoThousandEighteenMember
Carrying Value	115,089us-gaap_ConvertibleNotesPayable / us-gaap_LongtermDebtTypeAxis = rmbs_SeniorOnePointOneTwoFivePercentConvertibleNotesDueTwoThousandEighteenMember	109,629us-gaap_ConvertibleNotesPayable / us-gaap_LongtermDebtTypeAxis = rmbs_SeniorOnePointOneTwoFivePercentConvertibleNotesDueTwoThousandEighteenMember
Fair Value	$ 159,293us-gaap_ConvertibleDebtFairValueDisclosures / us-gaap_LongtermDebtTypeAxis = rmbs_SeniorOnePointOneTwoFivePercentConvertibleNotesDueTwoThousandEighteenMember	$ 142,427us-gaap_ConvertibleDebtFairValueDisclosures / us-gaap_LongtermDebtTypeAxis = rmbs_SeniorOnePointOneTwoFivePercentConvertibleNotesDueTwoThousandEighteenMember
Stated Interest rate (as a percent)	1.125%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = rmbs_SeniorOnePointOneTwoFivePercentConvertibleNotesDueTwoThousandEighteenMember

X

- Definition

Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Convertible Security

-URI http://asc.fasb.org/extlink&oid=6509036

+ Details

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X

- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of a written promise to pay a note, initially due after one year or beyond the operating cycle if longer, which can be exchanged for a specified amount of one or more securities (typically common stock), at the option of the issuer or the holder.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16(a))

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20, 22

-Article 5

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X

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

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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

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