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Segments and Major Customers (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Major Customer Disclosure
Revenue	$ 72,040us-gaap_SalesRevenueNet	$ 69,712us-gaap_SalesRevenueNet	$ 76,518us-gaap_SalesRevenueNet	$ 78,288us-gaap_SalesRevenueNet	$ 73,422us-gaap_SalesRevenueNet	$ 73,294us-gaap_SalesRevenueNet	$ 57,919us-gaap_SalesRevenueNet	$ 66,866us-gaap_SalesRevenueNet	$ 296,558us-gaap_SalesRevenueNet	$ 271,501us-gaap_SalesRevenueNet	$ 234,051us-gaap_SalesRevenueNet
Property, plant and equipment, net	64,023us-gaap_PropertyPlantAndEquipmentNet				72,642us-gaap_PropertyPlantAndEquipmentNet				64,023us-gaap_PropertyPlantAndEquipmentNet	72,642us-gaap_PropertyPlantAndEquipmentNet
South Korea
Major Customer Disclosure
Revenue									107,441us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_KR	112,806us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_KR	88,971us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_KR
USA
Major Customer Disclosure
Revenue									109,060us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US	80,652us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US	63,398us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US
Property, plant and equipment, net	63,000us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US				71,800us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US				63,000us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US	71,800us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US
Japan
Major Customer Disclosure
Revenue									30,454us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_JP	51,156us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_JP	63,686us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_JP
Europe
Major Customer Disclosure
Revenue									21,349us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember	15,985us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember	5,236us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember
Canada
Major Customer Disclosure
Revenue									7,119us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CA	7,896us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CA	7,759us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CA
Asia-Other
Major Customer Disclosure
Revenue									21,135us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = rmbs_AsiaOtherMember	3,006us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = rmbs_AsiaOtherMember	5,001us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = rmbs_AsiaOtherMember
India
Major Customer Disclosure
Property, plant and equipment, net	900us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_IN				700us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_IN				900us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_IN	700us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_IN
Other foreign locations
Major Customer Disclosure
Property, plant and equipment, net	$ 100us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = rmbs_OtherForeignLocationMember				$ 100us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = rmbs_OtherForeignLocationMember				$ 100us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = rmbs_OtherForeignLocationMember	$ 100us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = rmbs_OtherForeignLocationMember

X

- Definition

Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.13)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 13

-Subparagraph a

-Article 5



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 8

-Article 7

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementGeographicalAxis=country_IN
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementGeographicalAxis=country_JP
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementGeographicalAxis=country_KR
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementGeographicalAxis=country_US
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementGeographicalAxis=rmbs_AsiaOtherMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementGeographicalAxis=rmbs_OtherForeignLocationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementGeographicalAxis=us-gaap_EuropeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: