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v3.21.2

Segment Information (Details) - Customer concentration risk - Accounts receivable | Jun. 30, 2021 | Dec. 31, 2020
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Customer 1 |  |
Concentration risk |  |
Accounts receivable from major customer as a percentage of total accounts receivable | 13.00% | 13.00%
Customer 2 |  |
Concentration risk |  |
Accounts receivable from major customer as a percentage of total accounts receivable | 11.00% |
Customer 3 |  |
Concentration risk |  |
Accounts receivable from major customer as a percentage of total accounts receivable | 10.00% | 14.00%
Customer 4 |  |
Concentration risk |  |
Accounts receivable from major customer as a percentage of total accounts receivable |  | 11.00%

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- Definition Customer concentration risk + References No definition available. + Details
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Namespace Prefix: | rmbs_
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
Name: | us-gaap_ConcentrationRiskLineItems
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: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_AccountsReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period 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: |

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- Details
Name: | srt_MajorCustomersAxis=rmbs_Customer4Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |