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Commitments and Contingencies (Details) (USD $) | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2011 | Jun. 30, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 15, 2009
Lease Commitments |  |  |  |  |
Reimbursement received |  | $ 6,997,000 |  |  |
Total of imputed financing obligation | 34,596,000 | 34,596,000 | 27,899,000 |  |
MT SPE, LLC |  |  |  |  |
Lease Commitments |  |  |  |  |
Office space under lease (in square feet) |  |  |  |  | 125,000
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 (year number) |  |  |  |  | 10
Number of options |  |  |  |  | 2
Period for extension of lease (in months) |  |  |  |  | 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 to be received under lease agreement in year 2011 |  | 1,800,000 |  |  |
Reimbursement received |  | 7,000,000 | 300,000 |  |
Additional imputed financial obligation recognized | 7,300,000 | 7,300,000 |  |  |
Interest expense related to imputed financing obligation | 800,000 | 1,500,000 |  |  |
Total of imputed financing obligation | $ 33,800,000 | $ 33,800,000 |  |  |

X
- Definition Represents the cumulative additional imputed financial obligation recognized by the reporting entity as of the reporting period due to reimbursement received from landlord. + Details
Name: | rmbs_AdditionalCumulativeImputedFinancialObligationRecognizedAtReportingDate
Namespace Prefix: | rmbs
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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 Represents the amount of reimbursement under lease agreement from the landlord to be received in the current fiscal year. + Details
Name: | rmbs_LoansAndLeasesAmountToBeReceivedInFiscalYear
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 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 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 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

X
- 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

X
- 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

X
- 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

X
- Definition The amount of square footage related to office area. + Details
Name: | rmbs_SquareFootageOfOfficeArea
Namespace Prefix: | rmbs
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant