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Inventory - Narrative (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Inventory Disclosure [Abstract]
Prepaid commercial manufacturing	$ 16,145	$ 9,406
Prepaid commercial manufacturing, noncurrent	$ 3,800

X

- Definition

Prepaid Commercial Manufacturing, Current

+ References

No definition available.

+ Details

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

X

- Definition

Prepaid Commercial Manufacturing Expense, Noncurrent

+ References

No definition available.

+ Details

Name:	ardx_PrepaidCommercialManufacturingExpenseNoncurrent
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