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v3.23.1

Summary of Significant Accounting Policies - Revenue (Details) $ in Millions | Mar. 31, 2023 USD ($) unique_solution
--- | ---
Accounting Policies [Abstract] |
Reimbursement claims | unique_solution | 3,200
Revenue not yet recognized | $ | $ 8.9

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- Definition Unsubmitted Claims, Revenue Not Yet Recognized + References No definition available. + Details
Name: | cdna_UnsubmittedClaimsRevenueNotYetRecognized
Namespace Prefix: | cdna_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Unsubmitted Reimbursement Claims For Medicare + References No definition available. + Details
Name: | cdna_UnsubmittedReimbursementClaimsForMedicare
Namespace Prefix: | cdna_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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