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Leases Lease Arrangement (Details) - San Jose facility	Dec. 31, 2019 USD ($)	Jul. 08, 2019 USD ($) ft²
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

X

- 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

X

- 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_
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Balance Type:	debit
Period Type:	instant

X

- 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

X

- 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

X

- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

Name:	us-gaap_AreaOfRealEstateProperty
Namespace Prefix:	us-gaap_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

X

- 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

X

- 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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

X

- 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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Period Type:	instant

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- Details

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Namespace Prefix:
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Period Type: