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Liability Related to the Sale of Future Royalties and Milestones (Schedule of Liability Account) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2025 USD ($)
Liability Related To Sale Of Future Royalties And Milestones [Abstract]
Liability related to sale of future royalties and milestones - beginning balance	$ 337,539
Non-cash royalty revenue	(48,387)
Non-cash interest expense recognized	24,184
Liability related to sale of future royalties and milestones - ending balance	313,336
Less: unamortized transaction costs	(1,107)
Liability related to sale of future royalties and milestones, net	$ 312,229

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- 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

Liability related to sale of future royalties and milestones including unamortized transaction costs.

+ References

No definition available.

+ Details

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

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- Definition

Liability related to sale of future royalties and milestones net.

+ References

No definition available.

+ Details

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

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- Definition

Liability related to sale of future royalties, unamortized transaction costs.

+ References

No definition available.

+ Details

Name:	agen_LiabilityRelatedToSaleOfFutureRoyaltiesUnamortizedTransactionCosts
Namespace Prefix:	agen_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Definition

Non-cash interest expense related to sale of future royalties.

+ References

No definition available.

+ Details

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

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- Definition

Noncash royalty revenue recognized.

+ References

No definition available.

+ Details

Name:	agen_NoncashRoyaltyRevenueRecognized
Namespace Prefix:	agen_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration