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Liability Related to the Sale of Future Royalties and Milestones - Schedule of Gross Proceeds Allocated to Idenfified Components (Details) - Litigand [Member] - Purchase and Sale Agreement [Member] $ in Thousands	9 Months Ended
	Sep. 30, 2025 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
Total Ligand Purchase Agreement gross proceeds	$ 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

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

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- Definition

Proceeds from purchase agreement gross.

+ References

No definition available.

+ Details

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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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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Details

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- Details

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