Inventory - Narrative (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Inventory Disclosure [Abstract]
Prepaid commercial manufacturing	$ 17,793	$ 9,406
Prepaid commercial manufacturing, noncurrent	$ 3,800

Prepaid Commercial Manufacturing Expense, Noncurrent

No definition available.

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