Equity Sales Agreement, Proceeds From Shares Issued Since Inception

No definition available.

Name:	ardx_EquitySalesAgreementProceedsFromSharesIssuedSinceInception
Namespace Prefix:	ardx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Equity Sales Agreement, Shares Issued Since Inception

+ References

No definition available.

+ Details

Name:	ardx_EquitySalesAgreementSharesIssuedSinceInception
Namespace Prefix:	ardx_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of maximum aggregate offering price.

+ References

No definition available.

+ Details

Name:	ardx_MaximumAggregateOfferingPrice
Namespace Prefix:	ardx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Sale Of Stock, Weighted-Average Price Per Share

+ References

No definition available.

+ Details

Name:	ardx_SaleOfStockWeightedAveragePricePerShare
Namespace Prefix:	ardx_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of commission given on gross proceeds from sale of securities.

+ References

No definition available.

+ Details

Name:	ardx_StockIssuanceCostCommissionPercent
Namespace Prefix:	ardx_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The cash inflow from the additional capital contribution to the entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3255-108585

+ Details

Name:	us-gaap_ProceedsFromIssuanceOfCommonStock
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Number of new stock issued during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21463-112644

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI https://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_StockIssuedDuringPeriodSharesNewIssues
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_SubsidiarySaleOfStockLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=ardx_OpenMarketSalesAgreement2020AtTheMarketOfferingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=ardx_OpenMarketSalesAgreement2021AtTheMarketOfferingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=ardx_OpenMarketSalesAgreement2023AtTheMarketOfferingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Stockholders' Equity (Details) - USD ($) $ / shares in Units, shares in Millions		1 Months Ended	3 Months Ended	12 Months Ended			17 Months Ended
	Jan. 12, 2023	Jan. 31, 2023	Dec. 31, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2022	Aug. 31, 2021	Jul. 31, 2020
Subsidiary, Sale of Stock [Line Items]
Proceeds from issuance of common stock				$ 71,625,000	$ 101,146,000	$ 21,047,000
Common stock
Subsidiary, Sale of Stock [Line Items]
Maximum aggregate offering price									$ 250,000,000
Common stock \| Subsequent event
Subsidiary, Sale of Stock [Line Items]
Maximum aggregate offering price		$ 250,000,000
2020 Open Market Sales Agreement
Subsidiary, Sale of Stock [Line Items]
Offering sales commission (percent)				3.00%
Common stock sold and issued (in shares)					23.3
Proceeds from issuance of common stock					$ 100,000,000
2020 Open Market Sales Agreement \| Common stock
Subsidiary, Sale of Stock [Line Items]
Maximum aggregate offering price									$ 100,000,000
2021 Open Market Sales Agreement
Subsidiary, Sale of Stock [Line Items]
Offering sales commission (percent)							3.00%
Common stock sold and issued (in shares)			64.1
Proceeds from issuance of common stock				$ 73,100,000
Weighted-average share price (in dollars per share)				$ 1.14			$ 1.23
Total of shares sold			79.8	79.8			79.8
Total of gross proceeds			$ 98,100,000	$ 98,100,000			$ 98,100,000
2021 Open Market Sales Agreement \| Subsequent event
Subsidiary, Sale of Stock [Line Items]
Common stock sold and issued (in shares)	7.7
Proceeds from issuance of common stock	$ 20,000,000
Weighted-average share price (in dollars per share)	$ 2.60
2021 Open Market Sales Agreement \| Common stock
Subsidiary, Sale of Stock [Line Items]
Maximum aggregate offering price								$ 150,000,000
2023 Open Market Sales Agreement \| Subsequent event
Subsidiary, Sale of Stock [Line Items]
Offering sales commission (percent)		3.00%
2023 Open Market Sales Agreement \| Common stock \| Subsequent event
Subsidiary, Sale of Stock [Line Items]
Maximum aggregate offering price		$ 150,000,000