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Warrants - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Warrants and Rights Note Disclosure [Abstract]
Purchase of common stock warrants exercised (in shares)	0	272,000
Proceeds from warrant exercises (less than)	$ 0	$ 304
Number of warrants exercised on cashless basis (in shares)		34,000
Shares issued (in shares)		24,000

X

- Definition

Number Of Warrants Exercised, Cashless Basis

+ References

No definition available.

+ Details

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Balance Type:	na
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X

- Definition

Purchase of common stock warrants exercised.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Definition

Stock Issued During Period, Shares, Cashless Warrants Exercises In Period

+ References

No definition available.

+ Details

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Namespace Prefix:	cdna_
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X

- Definition

The cash inflow associated with the amount received from holders exercising their stock warrants.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585

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- References

No definition available.

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