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Settlement Agreement with Samsung (Details) (USD $)	3 Months Ended
	Mar. 31, 2011	Jan. 19, 2010
Current Cash Receipts
Quarterly License fee agreed to be paid by Samsung		$ 25,000,000
Gain from settlement	6,200,000
Total Gain from Settlement as of balance sheet date	$ 133,000,000

X

- Definition

Represents the expected recognition related to the gain from settlement as of balance sheet date.

+ References

No definition available.

+ Details

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X

- Definition

Represents the amount agreed to be paid per quarter by Samsung under Semiconductor Patent License Agreement.

+ References

No definition available.

+ Details

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Namespace Prefix:	rmbs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Details

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X

- Definition

The net proceeds or assets obtained in excess of (less than) the net carrying amount of assets recorded, or assets distributed and liabilities assumed less than (in excess of) estimated litigation liability extinguished, in settlement of a litigation matter. Represents (for other than an insurance entity in its normal claims settlement process), the amount of income (expense) recognized in the period to settle pending or threatened litigation and insurance claims.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 9, 10, 11, 12

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14326-108349

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