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Segments and Major Customers (Details 1) - Customer Concentration Risk - Accounts Receivable [Member]	Jun. 30, 2019	Dec. 31, 2018
Customer 1 [Member]
Concentration Risk [Line Items]
Customer concentration risk	30.00%	39.00%
Customer 2 [Member]
Concentration Risk [Line Items]
Customer concentration risk	11.00%
Customer 3 [Member]
Concentration Risk [Line Items]
Customer concentration risk		12.00%

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- Definition

Customer concentration risk

+ References

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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X

- Details

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X

- Details

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X

- Details

Name:	srt_MajorCustomersAxis=rmbs_Customer1Member
Namespace Prefix:
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Period Type:

X

- Details

Name:	srt_MajorCustomersAxis=rmbs_Customer2Member
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X

- Details

Name:	srt_MajorCustomersAxis=rmbs_Customer3Member
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