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Summary of Significant Accounting Policies (Details) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Weighted Average Number of Shares Outstanding, Basic [Abstract]
Basic (in shares)	115,024us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	114,523us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	114,116us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	113,590us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	113,217us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	112,640us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	112,183us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	111,599us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	114,318us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	112,415us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	110,769us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Financial Statement Presentation
Maximum ownership percentage									20.00%rmbs_CostMethodInvestmentMaximumOwnershipPercentage
Royalty Revenue
Number of types of royalty revenue streams									2rmbs_RevenueRecognitionNumberOfTypesOfRoyaltyRevenue
Stock-Based Compensation and Equity Incentive Plans
Discount from the fair market value (as a percent)									15.00%rmbs_ShareBasedCompensationArrangementByShareBasedPaymentAwardDiscountFromMarketPriceSpecificDate
Cash and Cash Equivalents
Maximum original maturity of cash equivalents (in months)									3 months
Minimum
Intangible Assets
Useful life (in years)									1 year	1 year
Maximum
Intangible Assets
Useful life (in years)									10 years	10 years

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Maximum percentage of ownership of common stock or equity participation in the investee accounted for under the cost method of accounting.

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The number of types of royalty revenues earned by the Company.

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The discount rate from market value on specific date that participants pay for shares.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ 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 (a)

-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

-Topic 260

-SubTopic 10

-Section 45

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-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256



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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Weighted-Average Number of Common Shares Outstanding

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