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Acquisitions (Details 1) (USD $) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Feb. 29, 2012 | Dec. 31, 2012 Item Patent | Feb. 03, 2012
Unity |  |  |
Retention bonus payable to Unity Employees |  |  | $ 5,000,000 rmbs_BusinessAcquisitionAmountPayableToEmployees / us-gaap_BusinessAcquisitionAxis = rmbs_UnitySemiconductorCorporationMember
Retention bonus payable to Unity employees (in years) | 3 years |  |
Related transaction costs |  |  | 600,000 us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts / us-gaap_BusinessAcquisitionAxis = rmbs_UnitySemiconductorCorporationMember
Cash |  |  | 182,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = rmbs_UnitySemiconductorCorporationMember
Property and equipment |  |  | 51,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = rmbs_UnitySemiconductorCorporationMember
Other tangible assets |  |  | 36,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther / us-gaap_BusinessAcquisitionAxis = rmbs_UnitySemiconductorCorporationMember
Identified intangible assets |  |  | 19,280,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = rmbs_UnitySemiconductorCorporationMember
Goodwill |  |  | 15,451,000 us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount / us-gaap_BusinessAcquisitionAxis = rmbs_UnitySemiconductorCorporationMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net |  |  | 35,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = rmbs_UnitySemiconductorCorporationMember
Estimated average useful life (in years) for intangible assets | 10 years |  |
Other business acquisition |  |  |
Identified intangible assets |  | 4,100,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = rmbs_OtherBusinessAcquisitionMember |
Goodwill |  | 8,100,000 us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount / us-gaap_BusinessAcquisitionAxis = rmbs_OtherBusinessAcquisitionMember |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net |  | 13,200,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = rmbs_OtherBusinessAcquisitionMember |
Estimated average useful life (in years) for intangible assets |  | 6 years |
Number of businesses acquired |  | 1 us-gaap_NumberOfBusinessesAcquired / us-gaap_BusinessAcquisitionAxis = rmbs_OtherBusinessAcquisitionMember |
Number of patent and technology acquisitions |  | 2 rmbs_NumberOfPatentAndTechnologyAcquisitions / us-gaap_BusinessAcquisitionAxis = rmbs_OtherBusinessAcquisitionMember |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  | $ 1,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = rmbs_OtherBusinessAcquisitionMember |

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Amount of other assets expected to be realized or consumed before one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 + Details
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