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Leases Lease Arrangement (Details) - San Jose facility | Dec. 31, 2019 USD ($) | Jul. 08, 2019 USD ($) ft²
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Lessee, Lease, Description [Line Items] |  |
Total space under lease (in square feet) | ft² |  | 90,000
Lessee, operating lease, term of contract |  | 128 months
Lessee, operating lease, variable rate, beginning of lease |  | $ 3.26
Lessee, operating lease, variable rate, end of lease |  | $ 4.38
Lessee, operating lease, renewal term |  | 60 months
Lessee, operating lease, future lease payments | $ 41,000,000 |
Total reimbursement receivable under lease agreement | $ 8,900,000 |

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- Definition Lessee, Operating Lease, Lease Not Yet Commenced, Future Lease Payments + References No definition available. + Details
Name: | rmbs_LesseeOperatingLeaseLeaseNotYetCommencedFutureLeasePayments
Namespace Prefix: | rmbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Lessee, Operating Lease, Lease Not Yet Commenced, Variable Rate, Beginning of Lease + References No definition available. + Details
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Namespace Prefix: | rmbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Lessee, Operating Lease, Lease Not Yet Commenced, Variable Rate, End of Lease + References No definition available. + Details
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Namespace Prefix: | rmbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Represents the total amount that the landlord has agreed to reimburse the reporting entity pursuant to the terms of the lease agreement. + References No definition available. + Details
Name: | rmbs_ReimbursementUnderLeasesToBeReceived
Namespace Prefix: | rmbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Area of a real estate property. + References No definition available. + Details
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Data Type: | num:areaItemType
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_LesseeLeaseDescriptionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Term of lessee's operating lease renewal for lease not yet commenced, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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- Definition Term of lessee's operating lease not yet commenced, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |