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Assets Held for Sale - Schedule of Assets and Liabilities Held for Sale (Parenthetical) (Details) $ in Thousands	Sep. 30, 2025 USD ($)
Discontinued Operations and Disposal Groups [Abstract]
Accumulated depreciation	$ 29,952

X

- Definition

Disposal group including discontinued operation accumulate depreciation.

+ References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

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