Contract Not With Customer, Liability, Tax Withholding Obligation

No definition available.

Name:	arqt_ContractNotWithCustomerLiabilityTaxWithholdingObligation
Namespace Prefix:	arqt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Contract Not With Customer, Upfront Payment, Net

+ References

No definition available.

+ Details

Name:	arqt_ContractNotWithCustomerUpfrontPaymentNet
Namespace Prefix:	arqt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

License Agreement, Number Of Years After First Commercial Sale To Receive Royalties

+ References

No definition available.

+ Details

Name:	arqt_LicenseAgreementNumberOfYearsAfterFirstCommercialSaleToReceiveRoyalties
Namespace Prefix:	arqt_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Revenue, Remaining Performance Obligation, Variable Consideration Amount, Regulatory Milestones

+ References

No definition available.

+ Details

Name:	arqt_RevenueRemainingPerformanceObligationVariableConsiderationAmountRegulatoryMilestones
Namespace Prefix:	arqt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Revenue, Remaining Performance Obligation, Variable Consideration Amount, Sales Milestones

+ References

No definition available.

+ Details

Name:	arqt_RevenueRemainingPerformanceObligationVariableConsiderationAmountSalesMilestones
Namespace Prefix:	arqt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 730
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483041/730-20-50-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 730
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483041/730-20-50-1

+ Details

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

- Definition

Amount of revenue that is not accounted for under Topic 606.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(1))
-SubTopic 10
-Topic 220
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2

+ Details

Name:	us-gaap_RevenueNotFromContractWithCustomer
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	srt_CounterpartyNameAxis=arqt_HuadongMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

License Agreements & Ducentis Acquisition - Huadong (Details) - USD ($) $ in Thousands	1 Months Ended						12 Months Ended
	Nov. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Sep. 30, 2023	Aug. 31, 2023	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Other revenue							$ 4,000	$ 30,000	$ 30,420
Huadong
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Net payment received	$ 1,800	$ 1,800	$ 1,800	$ 2,700	$ 27,000
Other revenue					30,000		4,000	5,000	30,000
Tax withholding obligation					$ 3,000		400	$ 500	$ 3,000
Revenue, remaining performance obligation, variable consideration amount, regulatory milestones							15,000
Aggregate amount to be received upon achievement of sales milestones							$ 40,300
Number of years after first commercial sale to receive royalties						10 years