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Liability Related to the Sale of Future Royalties and Milestones (Schedule of Liability Account) (Details) $ in Thousands | 9 Months Ended
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Sep. 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 | (77,535)
Non-cash interest expense recognized | 36,243
Liability related to sale of future royalties and milestones - ending balance | 296,247
Less: unamortized transaction costs | (1,074)
Liability related to sale of future royalties and milestones, net | $ 295,173

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- Definition Liability related to sale of future royalties and milestones. + References No definition available. + Details
Name: | agen_LiabilityRelatedToSaleOfFutureRoyaltiesAndMilestonesAbstract
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