XML 57 R46.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Fair Value Measurements - Summary of Issuances, Changes in Fair Value and Reclassifications of Level 3 Financial Instruments (Detail) - Fair Value Measured Using - (Level 3) [Member] $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 USD ($)
Significant Unobservable Inputs (Level 3) [Line Items] |
Beginning Balance | $ 34,984
Exercise of warrants | (127)
Conversion of JGB debt to common stock (Note 10) | (12,066)
Reclassification to equity (Note 2) | (6,550)
Change in estimated fair value | (1,178)
Ending Balance | 15,063
Common Stock Warrant Liability [Member] |
Significant Unobservable Inputs (Level 3) [Line Items] |
Beginning Balance | 18,712
Exercise of warrants | (127)
Conversion of JGB debt to common stock (Note 10) | 0
Reclassification to equity (Note 2) | (6,550)
Change in estimated fair value | 1,212
Ending Balance | 13,247
Contingent Consideration Liability [Member] |
Significant Unobservable Inputs (Level 3) [Line Items] |
Beginning Balance | 1,672
Exercise of warrants | 0
Conversion of JGB debt to common stock (Note 10) | 0
Reclassification to equity (Note 2) | 0
Change in estimated fair value | 144
Ending Balance | 1,816
Derivative Liability [Member] |
Significant Unobservable Inputs (Level 3) [Line Items] |
Beginning Balance | 14,600
Exercise of warrants | 0
Conversion of JGB debt to common stock (Note 10) | (12,066)
Reclassification to equity (Note 2) | 0
Change in estimated fair value | (2,534)
Ending Balance | $ 0

X
- Definition FairValue measurement with unobservable inputs reconciliation recurring basis exercise of warrants. + References No definition available. + Details
Name: | cdna_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisExerciseOfWarrants
Namespace Prefix: | cdna_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Fair value measurement with unobservable inputs reconciliation recurring basis liability reclassication to equity. + References No definition available. + Details
Name: | cdna_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityReclassicationToEquity
Namespace Prefix: | cdna_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of gain (loss) recognized on the income statement for financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShareholdersEquityClassAxis=cdna_CommonStockWarrantLiabilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByLiabilityClassAxis=cdna_ContingentConsiderationLiabilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByLiabilityClassAxis=us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |