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Commitments and Contingencies (Details)	Dec. 15, 2009 ft²
Sunnyvale Facility, Original agreement
Lease Commitments
Total space under lease (in square feet)	125,000

X

- Definition

-- None. No documentation exists for this element. --

+ References

No definition available.

+ Details

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Namespace Prefix:	rmbs_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	rmbs_OperatingLeaseArrangementAxis=rmbs_MtspellcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: