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Summary of Significant Accounting Policies - Summary of Payment Service Obligations (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
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Accounting Policies [Abstract] |  |
Outstanding Transaction Liabilities | $ 1,115,745 | $ 1,568,280
Other unregulated settlements | 38,535 | 10,376
Total payment service obligations | $ 1,154,280 | $ 1,578,656

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- Definition Payment service obligations. + References No definition available. + Details
Name: | avdx_PaymentServiceObligations
Namespace Prefix: | avdx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Service obligations liabilities. + References No definition available. + Details
Name: | avdx_ServiceObligationsLiabilities
Namespace Prefix: | avdx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Unregulated settlements with payees. + References No definition available. + Details
Name: | avdx_UnregulatedSettlementsWithPayees
Namespace Prefix: | avdx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration