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Commitments and Contingencies - Summary of Noncash Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows used for operating leases	$ 5,339	$ 5,454	$ 3,665
Total	$ 5,339	$ 5,454	$ 3,665

X

- Definition

Cash Flow, Lessee

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Definition

Payments For Operating and Finance Leases, Operating Activities

+ References

No definition available.

+ Details

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Namespace Prefix:	cdna_
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X

- Definition

Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 5
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479041/842-20-45-5

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (g)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-4

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