Debt instrument interest payments term.

No definition available.

Name:	arvn_DebtInstrumentInterestPaymentsTerm
Namespace Prefix:	arvn_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt instrument loan forgiveness.

+ References

No definition available.

+ Details

Name:	arvn_DebtInstrumentLoanForgiveness
Namespace Prefix:	arvn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Percentage of liquidated damages.

+ References

No definition available.

+ Details

Name:	arvn_PercentageOfLiquidatedDamages
Namespace Prefix:	arvn_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
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+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

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

- Definition

Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt classified as noncurrent. Excludes lease obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementGeographicalAxis=stpr_CT
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=arvn_TwoThousandAndFourteenAssistanceAgreementMember
Namespace Prefix:
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Period Type:

Long-Term Debt - Additional Information (Details) - USD ($) $ in Millions	1 Months Ended	6 Months Ended		12 Months Ended
	Sep. 30, 2018	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2014	Dec. 31, 2021
Debt Instrument [Line Items]
Loan forgiveness		$ 0.0	$ 1.0
Long term debt		$ 1.0			$ 1.0
2018 Assistance Agreement \| State of Connecticut
Debt Instrument [Line Items]
Debt instrument face amount	$ 2.0
Loan forgiveness	$ 1.0
Debt instrument bearing interest rate	3.25%
Debt instrument interest payments term (in months)	60 months
Percentage of liquidated damages	7.50%
2014 Assistance Agreement \| State of Connecticut
Debt Instrument [Line Items]
Debt instrument face amount				$ 2.5
Percentage of liquidated damages				7.50%