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Segments and Major Customers (Details 1) (Accounts Receivable [Member], Customer Concentration Risk)	Dec. 31, 2014	Dec. 31, 2013
Customer 1 [Member]
Concentration Risk
Customer concentration risk	33.00%rmbs_Customerconcentrationrisk / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = rmbs_Customer1Member
Customer 2 [Member]
Concentration Risk
Customer concentration risk	50.00%rmbs_Customerconcentrationrisk / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = rmbs_Customer2Member	73.00%rmbs_Customerconcentrationrisk / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = rmbs_Customer2Member

X

- Definition

Customer concentration risk

+ References

No definition available.

+ Details

Name:	rmbs_Customerconcentrationrisk
Namespace Prefix:	rmbs_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

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