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Segments and Major Customers (Details 1) - Accounts Receivable [Member] - Customer Concentration Risk	Dec. 31, 2018	Dec. 31, 2017
Customer 1 [Member]
Concentration Risk
Customer concentration risk	12.00%
Customer 2 [Member]
Concentration Risk
Customer concentration risk		12.00%
Customer 3 [Member]
Concentration Risk
Customer concentration risk	39.00%
Customer 4 [Member]
Concentration Risk
Customer concentration risk		13.00%
Customer 5 [Member] [Domain]
Concentration Risk
Customer concentration risk		11.00%

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- Definition

Customer concentration risk

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No definition available.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

Name:	srt_MajorCustomersAxis=rmbs_Customer1Member
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- Details

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- Details

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- Details

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- Details

Name:	srt_MajorCustomersAxis=rmbs_Customer5MemberDomain
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