XML 85 R74.htm IDEA: XBRL DOCUMENT v3.8.0.1

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2018
Income Taxes Disclosure [Line Items]
Benefit for income taxes	$ 424	$ 283
Scenario Plan [Member]
Income Taxes Disclosure [Line Items]
GILTI tax rate			10.50%

X

- Definition

Income Taxes Disclosure [Line Items]

+ References

No definition available.

+ Details

Name:	cdna_IncomeTaxesDisclosureLineItems
Namespace Prefix:	cdna_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tax cuts and jobs act of 2017 global intangible low taxed income tax rate.

+ References

No definition available.

+ Details

Name:	cdna_TaxCutsAndJobsActOf2017GlobalIntangibleLowTaxedIncomeTaxRate
Namespace Prefix:	cdna_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a),(b)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

Name:	us-gaap_IncomeTaxExpenseBenefit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_StatementScenarioAxis=us-gaap_ScenarioPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: