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Stockholders' Equity (Details)	Jan. 21, 2015 shares
Share repurchase program
Stock Repurchase Program, Number of Shares Authorized to be Repurchased	20,000,000.0

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 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