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Commitments and Contingencies (Details) - Yale University $ in Thousands |  | 1 Months Ended
--- | --- | ---
Jul. 05, 2013 USD ($) product | Jun. 30, 2024 USD ($)
Maximum |  |
Commitments And Contingencies [Line Items] |  |
Royalty payment | $ 500 |
Minimum |  |
Commitments And Contingencies [Line Items] |  |
Annual payment for license | $ 100 |
Number of licensed products | product | 2 |
Royalty payment | $ 200 |
Upfront Payment for Amended License Agreement and Novartis License and Asset Agreements |  |
Commitments And Contingencies [Line Items] |  |
Payments for collaboration |  | $ 14,950
Milestone Payment on First Anniversary of Signing |  |
Commitments And Contingencies [Line Items] |  |
Milestone payment the Company will make |  | 5,000
Milestone Payment Upon Approval of First and Second Royalty Products | Maximum |  |
Commitments And Contingencies [Line Items] |  |
Milestone payment the Company will make |  | $ 15,000
Success-Based Milestone Payments | License First Licensed Product |  |
Commitments And Contingencies [Line Items] |  |
Required milestone payments | 3,000 |
Success-Based Milestone Payments | License Second Licensed Product |  |
Commitments And Contingencies [Line Items] |  |
Required milestone payments | $ 1,500 |

X
- Definition Annual License Fee Payment + References No definition available. + Details
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Namespace Prefix: | arvn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Collaborative Arrangement, Rights And Obligations, Milestone Payment + References No definition available. + Details
Name: | arvn_CollaborativeArrangementRightsAndObligationsMilestonePayment
Namespace Prefix: | arvn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Commitments And Contingencies [Line Items] + References No definition available. + Details
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Namespace Prefix: | arvn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of Licensed Products + References No definition available. + Details
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Namespace Prefix: | arvn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Payments For Collaboration + References No definition available. + Details
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Namespace Prefix: | arvn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Required Milestone Payments + References No definition available. + Details
Name: | arvn_RequiredMilestonePayments
Namespace Prefix: | arvn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of cash paid for royalties during the current period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 25 -Subparagraph (g) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-25 + Details
Name: | us-gaap_PaymentsForRoyalties
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | srt_CounterpartyNameAxis=arvn_YaleUniversityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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- Details
Name: | us-gaap_TypeOfArrangementAxis=arvn_UpfrontPaymentForAmendedLicenseAgreementAndNovartisLicenseAndAssetAgreementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=arvn_MilestonePaymentOnFirstAnniversaryOfSigningMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=arvn_MilestonePaymentUponApprovalOfFirstAndSecondRoyaltyProductsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=arvn_SuccessBasedMilestonePaymentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_ProductOrServiceAxis=arvn_LicenseFirstLicensedProductMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |