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Segments and Major Customers (Details 1) - Customer Concentration Risk - Accounts Receivable [Member] | Mar. 31, 2019 | Dec. 31, 2018
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Customer 1 [Member] |  |
Concentration Risk [Line Items] |  |
Customer concentration risk |  | 12.00%
Customer 2 [Member] |  |
Concentration Risk [Line Items] |  |
Customer concentration risk | 14.00% |
Customer 3 [Member] |  |
Concentration Risk [Line Items] |  |
Customer concentration risk | 36.00% | 39.00%

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- Definition Customer concentration risk + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
Name: | srt_MajorCustomersAxis=rmbs_Customer1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_MajorCustomersAxis=rmbs_Customer2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_MajorCustomersAxis=rmbs_Customer3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |