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Summary of Significant Accounting Policies (Details) | 9 Months Ended
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Sep. 30, 2013
Royalty Revenue |
Number of days licensees have after the end of the quarter to provide notification of royalty revenue | 60 days
Number of days licensees have after the end of the quarter to provide payment of royalty revenue | 60 days
Number of days licensees have after the end of the quarter to provide payment of fixed royalty revenue | 45 days
Number of types of royalty revenue streams | 2

X
- Definition Represents the maximum period from the end of the quarter that a licensee has to provide payment of fixed royalties due to the entity. + References No definition available. + Details
Name: | rmbs_RevenueRecognitionMaximumPeriodAfterEndOfQuarterDuringWhichFixedRoyaltyIsDue
Namespace Prefix: | rmbs_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of types of royalty revenues earned by the Company. + References No definition available. + Details
Name: | rmbs_RevenueRecognitionNumberOfTypesOfRoyaltyRevenue
Namespace Prefix: | rmbs_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Revenue Recognition Required Notice Maximum Period after the End of Quarter During which Sales Occur + References No definition available. + Details
Name: | rmbs_RevenueRecognitionRequiredNoticeMaximumPeriodAfterEndOfQuarterDuringWhichSalesOccur
Namespace Prefix: | rmbs_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the maximum period from the end of the quarter that a licensee has to provide payment of royalties due to the entity. + References No definition available. + Details
Name: | rmbs_RevenueRecognitionRequiredPaymentMaximumPeriodAfterEndOfQuarterDuringWhichSalesOccur
Namespace Prefix: | rmbs_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RoyaltyRevenueAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration