XML 83 R91.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Acquisitions Acquisition (Additional Information) (Details) - USD ($) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Dec. 08, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Aug. 23, 2019
Business Acquisition [Line Items] |  |  |  |  |
Contractual obligation | [1],[2] |  | $ 222,804 |  |
Northwest Logic |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquisition-related costs |  |  | 700 |  |
Silicon IP and Business Protocols Business from Verimatrix |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquisition-related costs |  | $ 3,100 |  |  |
Goodwill expected to be tax deductible |  | 15,000 |  |  |
Retention bonus liability |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Contractual obligation | [1],[2],[3] |  | 9,998 |  |
Retention bonus liability | Northwest Logic |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Contractual obligation |  |  | 3,000 |  | $ 9,000
Retention bonus liability | Silicon IP and Business Protocols Business from Verimatrix |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Contractual obligation |  | $ 1,000 | $ 500 |  |
Minimum |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Useful life (in years) |  |  | 6 months | 1 year |
Minimum | In-process research and development | Silicon IP and Business Protocols Business from Verimatrix |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Useful life (in years) |  | 3 years |  |  |
Maximum |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Useful life (in years) |  |  | 10 years | 10 years |
Maximum | In-process research and development | Silicon IP and Business Protocols Business from Verimatrix |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Useful life (in years) |  | 5 years |  |  |
[1] | For the Company’s lease commitments as of December 31, 2019, refer to Note 10, “Leases.”
[2] | The above table does not reflect possible payments in connection with unrecognized tax benefits of approximately $24.6 million including $22.8 million recorded as a reduction of long-term deferred tax assets and $1.8 million in long-term income taxes payable, as of December 31, 2019. As noted below in Note 19, “Income Taxes,” although it is possible that some of the unrecognized tax benefits could be settled within the next 12 months, the Company cannot reasonably estimate the outcome at this time.
[3] | In connection with the acquisitions of Northwest Logic in August 2019 and the Secure Silicon IP and Protocols business in December 2019, the Company is obligated to pay retention bonuses to certain employees subject to certain eligibility and acceleration provisions including the condition of employment.

X
- Definition Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition. + References No definition available. + Details
Name: | us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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_BusinessAcquisitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
Name: | us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments. + References No definition available. + Details
Name: | us-gaap_ContractualObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=rmbs_NorthwestLogicMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=rmbs_SiliconIPandBusinessProtocolsBusinessfromVerimatrixDomain
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | rmbs_ContractualObligationAxis=rmbs_BusinessAcquisitionRetentionBonusPayableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_InProcessResearchAndDevelopmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |