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Liability Related to the Sale of Future Royalties and Milestones - Schedule of Gross proceeds was allocated to the identified components (Details) - Litigand [Member] - Purchase and Sale Agreement [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2024 USD ($)
Liability Related To Sale Of Future Royalties And Milestones [Line Items]
Liability related to sale of future royalties and milestones	$ 63,879
Warrant	7,098
Purchaser Upsize Option	4,023
Proceeds From Purchase Agreement Gross	$ 75,000

X

- Definition

Liability related to sale of future royalties and milestones.

+ References

No definition available.

+ Details

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Namespace Prefix:	agen_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Liability related to sale of future royalties and milestones.

+ References

No definition available.

+ Details

Name:	agen_LiabilityRelatedToSaleOfFutureRoyaltiesAndMilestonesLineItems
Namespace Prefix:	agen_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Proceeds from purchase agreement gross.

+ References

No definition available.

+ Details

Name:	agen_ProceedsFromPurchaseAgreementGross
Namespace Prefix:	agen_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Purchaser upsize pption

+ References

No definition available.

+ Details

Name:	agen_PurchaserUpsizeOption
Namespace Prefix:	agen_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

+ Details

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

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- Details

Name:	dei_LegalEntityAxis=agen_LigandPharmaceuticalsIncorporatedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Balance Type:
Period Type: