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Segments and Major Customers (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Financial information of business segments
Revenues	$ 72,914us-gaap_SalesRevenueNet	$ 78,288us-gaap_SalesRevenueNet
Segment operating expenses	26,118rmbs_OperatingExpensesSegment	24,465rmbs_OperatingExpensesSegment
Segment operating income (loss)	46,796rmbs_SegmentOperatingIncomeLoss	53,823rmbs_SegmentOperatingIncomeLoss
Segment reconciling items	(28,904)rmbs_Segmentreconcilingitems	(30,634)rmbs_Segmentreconcilingitems
Operating income (loss)	17,892us-gaap_OperatingIncomeLoss	23,189us-gaap_OperatingIncomeLoss
Interest and other income (expense), net	(2,951)us-gaap_NonoperatingIncomeExpense	(9,913)us-gaap_NonoperatingIncomeExpense
Income (Loss) before income taxes	14,941us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	13,276us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
MID Segment
Financial information of business segments
Revenues	54,733us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember	61,156us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember
Segment operating expenses	11,520rmbs_OperatingExpensesSegment / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember	9,281rmbs_OperatingExpensesSegment / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember
Segment operating income (loss)	43,213rmbs_SegmentOperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember	51,875rmbs_SegmentOperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember
CRD Segment
Financial information of business segments
Revenues	12,826us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = rmbs_CRDMemberDomain	12,903us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = rmbs_CRDMemberDomain
Segment operating expenses	7,339rmbs_OperatingExpensesSegment / us-gaap_StatementBusinessSegmentsAxis = rmbs_CRDMemberDomain	6,531rmbs_OperatingExpensesSegment / us-gaap_StatementBusinessSegmentsAxis = rmbs_CRDMemberDomain
Segment operating income (loss)	5,487rmbs_SegmentOperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = rmbs_CRDMemberDomain	6,372rmbs_SegmentOperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = rmbs_CRDMemberDomain
Other
Financial information of business segments
Revenues	5,355us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	4,229us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Segment operating expenses	7,259rmbs_OperatingExpensesSegment / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	8,653rmbs_OperatingExpensesSegment / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Segment operating income (loss)	$ (1,904)rmbs_SegmentOperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	$ (4,424)rmbs_SegmentOperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember

X

- Definition

Operating Expenses, Segment

+ References

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- Definition

Total operating income loss for reporting segments.

+ References

No definition available.

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- Definition

Segment reconciling items

+ References

No definition available.

+ Details

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- Definition

This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 940

-SubTopic 20

-Section 25

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-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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-Paragraph 10

-Article 5

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- Definition

The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

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- Definition

The net result for the period of deducting operating expenses from operating revenues.

+ References

No definition available.

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- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

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