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Recent Accounting Pronouncement (Details)	12 Months Ended
	Dec. 31, 2011 statement
Recent Accounting Pronouncement
Number of statements under alternative one	1
Number of statements under alternative two	2

X

- Definition

Represents the number of statements presented by the entity under the first alternative per recently issued accounting standards.

+ References

No definition available.

+ 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 under the second alternative per recently issued accounting standards.

+ References

No definition available.

+ 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