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Stockholders' Equity (details 1) (USD $) In Millions, except Share data, unless otherwise specified | Dec. 31, 2014 | Feb. 25, 2010 | Jan. 21, 2015
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Share repurchase program |  |  |
Number of shares authorized to be repurchased under the plan | 19,000,000 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased |  |
Additional number of shares authorized to be repurchased |  | 12,500,000 rmbs_StockRepurchaseProgramAdditionalNumberOfSharesAuthorizedToBeRepurchased |
Cumulative shares that have been repurchased in stock repurchase program | 26,300,000 rmbs_StockRepurchaseProgramCommencementToDateRepurchasedNumberOfShares |  |
Cumulative value of shares that have been repurchased in stock repurchase program | $ 428.9 rmbs_StockRepurchaseProgramCommencementToDateRepurchasedValue |  |
Remaining shares authorized to be repurchased | 5,200,000 us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased |  |
Subsequent Event [Member] |  |  |
Share repurchase program |  |  |
Number of shares authorized to be repurchased under the plan |  |  | 20,000,000 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

X
- Details
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Namespace Prefix: | rmbs_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the additional number of shares authorized to be repurchased by the entity's Board of Directors under the stock repurchase plan. + References No definition available. + Details
Name: | rmbs_StockRepurchaseProgramAdditionalNumberOfSharesAuthorizedToBeRepurchased
Namespace Prefix: | rmbs_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The cumulative number of shares that have been repurchased since the commencement of the stock repurchase agreement. + References No definition available. + Details
Name: | rmbs_StockRepurchaseProgramCommencementToDateRepurchasedNumberOfShares
Namespace Prefix: | rmbs_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The cumulative value of shares that have been repurchased since the commencement of the stock repurchase agreement. + References No definition available. + Details
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Namespace Prefix: | rmbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |