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Collaboration and Licensing Agreements - Deferred Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Deferred revenue - current |  |
Beginning balance | $ 4,211 |
Ending balance | 5,545 |
Deferred revenue - non-current |  |
Beginning balance | 9,025 |
Ending balance | 11,498 |
2017 KKC Agreement |  |
Deferred revenue - current |  |
Beginning balance | 4,211 | $ 0
Increases due to amounts reclassified from non-current, to be recognized in the next twelve months | 809 |
Increases to amounts invoiced, for which cash has not yet been received | 525 | 0
Ending balance | 5,545 | 0
Deferred revenue - non-current |  |
Beginning balance | 9,025 | 4,727
Increases to amounts invoiced, for which cash has not yet been received | 3,282 | 3,829
Increase due to unbilled prepayments recorded during the period | 0 | 7
Decreases due to amounts reclassified as current, to be recognized in the next twelve months | (809) | 0
Ending balance | $ 11,498 | $ 8,563

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- Definition Change In Contract With Customer Liability, Current, Rollforward + References No definition available. + Details
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- Definition Change In Contract With Customer Liability, Noncurrent, Rollforward + References No definition available. + Details
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- Definition Contract With Customer, Liability, Decrease In Revenue, To Be Recognized In Next Twelve Months + References No definition available. + Details
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- Definition Contract With Customer, Liability, Increase Due To Unbilled Prepayments Recorded + References No definition available. + Details
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- Definition Contract With Customer, Liability, Increase For Amounts Invoiced + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Contract With Customer, Liability, Revenue Invoiced But Cash Not Received + References No definition available. + Details
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Namespace Prefix: | ardx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Contract With Customer, Liability, Revenue To Be Recognized In Next Twelve Months + References No definition available. + Details
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Namespace Prefix: | ardx_
Data Type: | xbrli:monetaryItemType
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Period Type: | duration

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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=126919976&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=126919976&loc=SL49130532-203044 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130549-203045 + Details
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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=126919976&loc=SL49130532-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=126919976&loc=SL49130531-203044 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130549-203045 + Details
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- Details
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Period Type: |