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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