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v3.20.2

Subsequent Events - Additional Information (Details) - Subsequent Event [Member] - USD ($) | Oct. 09, 2020 | Oct. 08, 2020
--- | --- | ---
Subsequent Event [Line Items] |  |
Prepayment fee (as a percent) | 4.95% | 3.95%
Amendment fee | $ 125,000 |
LIBOR | Minimum |  |
Subsequent Event [Line Items] |  |
Floating interest rate (as a percent) | 0.25% |

X
- Definition Amount of amendment fee that the company has to pay to the lenders, under the debt instrument. + References No definition available. + Details
Name: | ardx_DebtInstrumentAmendmentFeeAmount
Namespace Prefix: | ardx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The percentage of fee payable on prepayment of debt. + References No definition available. + Details
Name: | ardx_PrepaymentFeePercentage
Namespace Prefix: | ardx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |