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Recent Accounting Pronouncements (Details)	6 Months Ended
	Jun. 30, 2011
Recent Accounting Pronouncements
Number of statements under alternative one	1
Number of statements presented by the entity	2

X

- Definition

Represents the number of statements presented by the entity to reflect the components of other comprehensive income under the first alternative as per recently issued accounting standards.

+ Details

Name:	rmbs_NewAccountingPronouncementOrChangeInAccountingPrincipleAlternativeOneNumberOfStatements
Namespace Prefix:	rmbs
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the number of statements presented by the entity to reflect the net income, total net income, components of other comprehensive income and total of other comprehensive income.

+ Details

Name:	rmbs_NewAccountingPronouncementOrChangeInAccountingPrincipleNumberOfSeparateStatements
Namespace Prefix:	rmbs
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_NewAccountingPronouncementsAndChangesInAccountingPrinciplesAbstract
Namespace Prefix:	us-gaap
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration