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Subsequent Events (Details) - Subsequent event - KKC - 2017 KKC Agreement $ in Thousands | Apr. 11, 2022 USD ($) payment_tranche
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Subsequent Event [Line Items] |
Fee receivable for reduction in royalty rate | $ | $ 40,000
Number of payment tranches for fee receivable for reduction in royalty rate | payment_tranche | 2

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- Definition Collaborative Arrangement, Fee Receivable For Reduction In Royalty Rate + References No definition available. + Details
Name: | ardx_CollaborativeArrangementFeeReceivableForReductionInRoyaltyRate
Namespace Prefix: | ardx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Collaborative Arrangement, Fee Receivable For Reduction In Royalty Rate, Number Of Payment Tranches + References No definition available. + Details
Name: | ardx_CollaborativeArrangementFeeReceivableForReductionInRoyaltyRateNumberOfPaymentTranches
Namespace Prefix: | ardx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- 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

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

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- Details
Name: | srt_CounterpartyNameAxis=ardx_KyowaKirinCo.LtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_TypeOfArrangementAxis=ardx_LicenseAgreementDevelopmentCommercializationDistributionInJapanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |