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Stockholders' Equity (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2015	Mar. 31, 2016	Jan. 21, 2015
Share repurchase program
Stock Repurchase Program, Number of Shares Authorized to be Repurchased			20,000,000.0
UpfrontPaymentUnderAcceleratedStockRepurchaseProgram	$ 100,000
Stock Repurchased and Retired During Period, Shares	7,812,000
Stock Repurchased and Retired During Period, Value	$ 80,000
UnsettledForwardContractIndexedtoIssuersStockClassifiedwithinStock	$ 20,000
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased		12,200,000

X

- Definition

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

+ References

No definition available.

+ Details

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

X

- Definition

The excess of the amount paid under the accelerated stock repurchase agreement at inception relative to the fair value of the initial delivery of shares, evaluated as an unsettled forward contract indexed to the issuer's stock and reduced from Stockholders' Equity.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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X

- Definition

The upfront payment in exchange for initial delivery of shares under the accelerated stock repurchase program.

+ References

No definition available.

+ Details

Name:	rmbs_UpfrontPaymentUnderAcceleratedStockRepurchaseProgram
Namespace Prefix:	rmbs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

+ Details

Name:	us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

+ Details

Name:	us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of shares that have been repurchased and retired during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30
-Article 5

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30, 31
-Article 5

+ Details

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Balance Type:	debit
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