XML 47 R33.htm IDEA: XBRL DOCUMENT
v3.21.2

Collaboration, License, and Other Agreements - Sanofi, Antibody Narrative (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Apr. 01, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | $ 3,452.8 | $ 2,294.0 | $ 11,120.0 | $ 6,074.2
Sanofi Collaboration Agreement, Antibody |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Levels of twelve-month sales at which sales milestone payments would be received |  |  |  | $ 1,500.0 | $ 1,000.0
Period for achieving sales target for milestone payment, rolling basis |  |  |  | 12 months | 12 months
Remaining amount of sales milestone payments if total sales achieve specific levels |  |  |  | $ 150.0 |
Sanofi Collaboration Agreement, Antibody | First Sales Milestone |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  |  | $ 50.0 |  |
Sanofi Collaboration Agreement, Antibody | Second Sales Milestone |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | $ 50.0 |  |  |
Sanofi Collaboration Agreement, Antibody | Minimum |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Percentage of trial costs required to be funded by collaborating party |  |  |  | 80.00% |
Sanofi Collaboration Agreement, Antibody | Maximum |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Percentage of trial costs required to be funded by collaborating party |  |  |  | 100.00% |
Praluent Agreement |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Royalty percentage to be received on net product sales outside of the United States | 5.00% |  |  |  |
Percentage of damages company is responsible for | 50.00% |  |  |  |
Praluent Agreement | Sanofi |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Percentage of royalty payment that can be used to offset litigation proceedings (up to) | 50.00% |  |  |  |

X
- Definition Levels Of Twelve Month Sales At Which Sales Milestone Payments Would Be Received + References No definition available. + Details
Name: | regn_LevelsOfTwelveMonthSalesAtWhichSalesMilestonePaymentsWouldBeReceived
Namespace Prefix: | regn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Loss Contingency, Percentage Of Damages Responsible For + References No definition available. + Details
Name: | regn_LossContingencyPercentageOfDamagesResponsibleFor
Namespace Prefix: | regn_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage Of Royalty Payment That Can Be Offset + References No definition available. + Details
Name: | regn_PercentageOfRoyaltyPaymentThatCanBeOffset
Namespace Prefix: | regn_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of Trial Costs Required To Be Funded By Collaborating Party + References No definition available. + Details
Name: | regn_PercentageOfTrialCostsRequiredToBeFundedByCollaboratingParty
Namespace Prefix: | regn_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period for Achieving Sales Target for Milestone Payment, Rolling Basis + References No definition available. + Details
Name: | regn_PeriodForAchievingSalesTargetForMilestonePaymentRollingBasis
Namespace Prefix: | regn_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Remaining Amount Of Sales Milestone Payments If Total Sales Achieve Specific Levels + References No definition available. + Details
Name: | regn_RemainingAmountOfSalesMilestonePaymentsIfTotalSalesAchieveSpecificLevels
Namespace Prefix: | regn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Royalty Percentage To Be Received On Net Product Sales Outside Of United States + References No definition available. + Details
Name: | regn_RoyaltyPercentageToBeReceivedOnNetProductSalesOutsideOfUnitedStates
Namespace Prefix: | regn_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9031-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9038-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8933-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130543-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8736-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9054-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130545-203045 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details
Name: | us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis=regn_SanofiCollaborationAgreementAntibodyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | regn_SalesMilestonesAxis=regn_SalesMilestoneOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis=regn_PraluentCrossLicenseAndCommercializationAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=regn_SanofiMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |