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Commitments and Contingencies (Details) (USD $) | 9 Months Ended |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended |
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Sep. 30, 2011 | Dec. 31, 2010 | Dec. 31, 2009 MT SPE, LLC squarefoot | Sep. 30, 2011 MT SPE, LLC | Sep. 30, 2011 MT SPE, LLC | Dec. 31, 2010 MT SPE, LLC | Dec. 15, 2009 MT SPE, LLC month option year | Oct. 31, 2011 Fogg-Brecksville Development Co. squarefoot | Oct. 02, 2011 Fogg-Brecksville Development Co. extension month | Oct. 31, 2011 Expansion A squarefoot | Oct. 02, 2011 Expansion A | Oct. 31, 2011 Expansion B squarefoot | Oct. 02, 2011 Expansion B
Lease Commitments |  |  |  |  |  |  |  |  |  |  |  |  |
Lease term (in months) |  |  |  |  |  |  | 120 |  |  |  |  |  |
Initial annual base rent amount |  |  |  |  |  |  | $ 3,700,000 |  |  |  |  |  |
Base rent amount for the 10th year |  |  |  |  |  |  | 4,800,000 |  |  |  |  |  |
Final year number of the lease for which the annual base rent is disclosed (in years) |  |  |  |  |  |  | 10 |  |  |  |  |  |
Number of options (in options) |  |  |  |  |  |  | 2 |  |  |  |  |  |
Period for extension of lease (in months) |  |  |  |  |  |  | 60 |  | 60 |  |  |  |
Period for termination of lease (in months) |  |  |  |  |  |  | 84 |  |  |  |  |  |
Capitalized property plant and equipment |  |  | 25,100,000 |  |  |  |  |  |  |  |  |  |
Capitalization of interest on the building |  |  |  |  |  | 1,500,000 |  |  |  |  |  |  |
Total reimbursement receivable under lease agreement |  |  |  | 9,100,000 | 9,100,000 |  |  |  |  |  |  |  |
Reimbursement received | 8,800,000 |  |  |  | 8,800,000 | 300,000 |  |  |  |  |  |  |
Interest expense related to imputed financing obligation |  |  |  | 800,000 | 2,300,000 |  |  |  |  |  |  |  |
Total of imputed financing obligation | 36,386,000 | 27,899,000 |  | 35,600,000 | 35,600,000 |  |  |  |  |  |  |  |
Total expanded space under lease (in square feet) |  |  |  |  |  |  |  | 25,730 |  | 10,858 |  | 14,872 |
Total space under lease (in square feet) |  |  | 125,000 |  |  |  |  | 50,545 |  |  |  |  |
Number of extensions to be constructed |  |  |  |  |  |  |  |  | 2 |  |  |  |
Lease Term after Completion of Expansions |  |  |  |  |  |  |  |  | 84 |  |  |  |
Annual base rent upon completion of expansion |  |  |  |  |  |  |  |  |  |  | $ 587,000 |  | $ 831,000
Percentage increase in annual base rent |  |  |  |  |  |  |  |  | 2.00% |  |  |  |

X
- Definition The amount of expanded square footage related to a real estate property under lease. + Details
Name: | rmbs_ExpandedSquareFootageOfRealEstateProperty
Namespace Prefix: | rmbs
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the interest expense in connection with the imputed financing obligation during the period. + Details
Name: | rmbs_FinancingExpenseFromLeaseFacilities
Namespace Prefix: | rmbs
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The unamortized amount of long-term liabilities that an Entity assumes in consideration for the estimated fair value of the Entity's share of buildings in the build out of leased facilities plus any tenant improvement allowance received from landlords. As the Entity retains sufficient continuing involvement following the completion of construction, for accounting purposes, the Entity is treated as the owner of the leased facilities and to record an imputed financing obligation for its obligation to the legal owners. + Details
Name: | rmbs_LongTermImputedFinancingObligation
Namespace Prefix: | rmbs
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the number of extensions to be constructed by the landlord. + Details
Name: | rmbs_NumberOfExtensionsToBeConstructed
Namespace Prefix: | rmbs
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the year number of the lease for which the annual base rent is disclosed. + Details
Name: | rmbs_OperatingLeaseCommitmentAnnualBaseRentLeaseYearNumberOfAmountDisclosed
Namespace Prefix: | rmbs
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the annual base rent upon the substantial completion of expansion. + Details
Name: | rmbs_OperatingLeaseCommitmentAnnualBaseRentUponCompletionOfExpansion
Namespace Prefix: | rmbs
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the fixed base rent amount in the tenth year. + Details
Name: | rmbs_OperatingLeaseCommitmentAnnualBaseTenthYear
Namespace Prefix: | rmbs
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the initial annual base rent under the lease agreement. + Details
Name: | rmbs_OperatingLeaseCommitmentInitialAnnualBaseRent
Namespace Prefix: | rmbs
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | rmbs_OperatingLeaseCommitmentLineItems
Namespace Prefix: | rmbs
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the extension period under each option of lease expressed in months. + Details
Name: | rmbs_OperatingLeaseCommitmentNumberOfExtendedMonthsUnderOptions
Namespace Prefix: | rmbs
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the number of options to extend the lease. + Details
Name: | rmbs_OperatingLeaseCommitmentNumberOfOptionToExtendLeaseAgreement
Namespace Prefix: | rmbs
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the percentage increase in annual base rent each year on the annual anniversary date of the first extended term commencement date over the course of the lease term. + Details
Name: | rmbs_OperatingLeaseCommitmentPercentageIncreaseInAnnualBaseRentEachYear
Namespace Prefix: | rmbs
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Represents the number of months after which lease can be terminated. + Details
Name: | rmbs_OperatingLeaseCommitmentTerminationPeriod
Namespace Prefix: | rmbs
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Specifies the time period covered by the operating lease arrangement after completion of Expansions, expressed in months. + Details
Name: | rmbs_OperatingLeaseCommitmentTimeExtendedInMonths
Namespace Prefix: | rmbs
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Specifies the time period covered by the operating lease arrangement expressed in months. + Details
Name: | rmbs_OperatingLeaseCommitmentTimePeriodInMonths
Namespace Prefix: | rmbs
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The cash inflow associated with tenant improvement allowance received from landlords related to the leased facilities, in which for accounting purposes the Entity is treated as the owner as the Entity retains sufficient continuing involvement following the completion of construction. + Details
Name: | rmbs_ProceedsFromLeaseFinancingObligation
Namespace Prefix: | rmbs
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the total capitalized amount of property, plant and equipment which was based on the estimated fair value of the portion of the unfinished leased building along with a corresponding financing obligation for the same amount. + Details
Name: | rmbs_PropertyPlantAndEquipmentCostCapitalizationAmount
Namespace Prefix: | rmbs
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Represents the interest amount that the reporting entity capitalized on the leased building with a corresponding imputed financing obligation for the same amount. + Details
Name: | rmbs_PropertyPlantAndEquipmentInterestCapitalizationAmount
Namespace Prefix: | rmbs
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Represents the total amount that the landlord has agreed to reimburse the reporting entity pursuant to the terms of the lease agreement. + Details
Name: | rmbs_ReimbursementUnderLeasesToBeReceived
Namespace Prefix: | rmbs
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The amount of square footage related to a real estate property. + Details
Name: | us-gaap_SquareFootageOfRealEstateProperty
Namespace Prefix: | us-gaap
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration