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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