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INVENTORY - Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Inventory Disclosure [Abstract]
Prepaid commercial manufacturing	$ 8.1	$ 16.4
Prepaid commercial manufacturing, non-current	$ 0.0	$ 0.0

X

- Definition

Prepaid Commercial Manufacturing

+ References

No definition available.

+ Details

Name:	ardx_PrepaidCommercialManufacturing
Namespace Prefix:	ardx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Prepaid Commercial Manufacturing, Non Current

+ References

No definition available.

+ Details

Name:	ardx_PrepaidCommercialManufacturingNonCurrent
Namespace Prefix:	ardx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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