Represents notice period for termination of contract.

No definition available.

Name:	arql_NoticePeriodForTerminationOfContract
Namespace Prefix:	arql_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The percentage of royalties expected to be received from collaboration.

+ References

No definition available.

+ Details

Name:	arql_PercentageOfRoyaltiesExpectedToBeReceivedFromCollaborationLowerRange
Namespace Prefix:	arql_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The percentage of royalties expected to be received from collaboration.

+ References

No definition available.

+ Details

Name:	arql_PercentageOfRoyaltiesExpectedToBeReceivedFromCollaborationUpperRange
Namespace Prefix:	arql_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Aggregate revenue during the period from research and development agreements.

+ References

No definition available.

+ Details

Name:	arql_ResearchAndDevelopmentRevenue
Namespace Prefix:	arql_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The sum of potential development and sales milestone payment received.

+ References

No definition available.

+ Details

Name:	arql_RevenueFromPotentialFutureMilestonesAndRoyalties
Namespace Prefix:	arql_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Upfront licensing payments paid for the development, manufacturing and marketing on a worldwide basis.

+ References

No definition available.

+ Details

Name:	arql_UpfrontLicensingPaymentsCash
Namespace Prefix:	arql_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

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

- Definition

Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 13.A.4(a).Q1 Response)
-URI http://asc.fasb.org/extlink&oid=27012821&loc=d3e214044-122780

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 13
-Section A

+ Details

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

- Definition

The amount of compensation earned (contract income) under a research and development arrangement accounted for as a contract to perform research and development for others.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 730
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6420387&loc=d3e23199-108380

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 730
-SubTopic 20
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6420387&loc=d3e23221-108380

+ Details

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

- Definition

The amount of consideration recognized during the period for the milestone or milestones.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 28
-Section 50
-Paragraph 2
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=51671726&loc=SL6892177-166501

+ Details

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

- Details

Name:	us-gaap_TypeOfArrangementAxis=arql_KyowaHakkoKirinLicensingAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	arql_PhasesAxis=arql_PhaseTwoTrialKyowaHakkoKirinMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	arql_PhasesAxis=arql_PhaseThreeAttentionTrialAsiaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LeaseArrangementTypeAxis=arql_KyowaHakkoKirinMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

COLLABORATIONS AND ALLIANCES (Detail Textuals 1) - USD ($) $ in Thousands		1 Months Ended				3 Months Ended
	May. 07, 2007	Aug. 31, 2011	Sep. 30, 2010	Feb. 29, 2008	Apr. 27, 2007	Mar. 31, 2016	Mar. 31, 2015
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Research and development revenue						$ 1,227	$ 2,785
Kyowa Hakko Kirin Licensing Agreement
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Upfront payment received	$ 27,000				$ 3,000
Upfront and potential development milestone payments					123,000
Cash upfront licensing payments					$ 30,000
Notice period for termination of contract						90 days
Research and development revenue						$ 500	$ 1,400
Deferred revenue						$ 1,400
Kyowa Hakko Kirin Licensing Agreement \| Phase Two trial Kyowa Hakko Kirin
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Milestone payment received			$ 5,000
Kyowa Hakko Kirin Licensing Agreement \| Phase Three Attention Trial Asia
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Milestone payment received		$ 10,000
Kyowa Hakko Kirin Licensing Agreement \| Kyowa Hakko Kirin
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Milestone payment received				$ 3,000
Percentage of royalties expected to be received - lower range				mid-teen percent
Percentage of royalties expected to be received - upper range				low-twenty percent