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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
	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

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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
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Balance Type:	debit
Period Type:	duration

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- 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

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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

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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

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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

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Namespace Prefix:	rmbs
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- 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

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Namespace Prefix:	rmbs
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

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- Definition

Represents the number of options to extend the lease.

+ Details

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Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

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- 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.

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Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Specifies the time period covered by the operating lease arrangement after completion of Expansions, expressed in months.

+ Details

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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.

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Namespace Prefix:	rmbs
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

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- 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

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- 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

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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.

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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

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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

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Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration