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Debt - Additional Information (Detail) (USD $)
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0 Months Ended |
1 Months Ended |
3 Months Ended |
12 Months Ended |
1 Months Ended |
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Jul. 22, 2014
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Aug. 31, 2012
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Jul. 22, 2014
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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Apr. 30, 2012
Debt_Instruments
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Apr. 17, 2014
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Dec. 31, 2011
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Aug. 31, 2013
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| Debt Instrument [Line Items] |
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| Loan and security agreement cost |
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$ 15,000,000us-gaap_DebtInstrumentFaceAmount |
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| Total repayment of principal |
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10,333,833us-gaap_DebtInstrumentPeriodicPaymentPrincipal |
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| Termination fee paid |
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875,000cdna_DebtInstrumentTerminationFeeAmount |
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| Interest expense |
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628,000us-gaap_InterestExpenseDebt |
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| Net cash proceeds from loan |
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3,432,260us-gaap_ProceedsFromIssuanceOfDebt |
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| Loan deferral additional fee |
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150,000us-gaap_DebtInstrumentCollateralFee |
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| Loan to defer the beginning of principal repayment |
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Mar. 01, 2014 |
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| Interest payment |
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566,822us-gaap_DebtInstrumentPeriodicPayment |
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| Annual interest rate |
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9.95%us-gaap_DebtInstrumentInterestRateStatedPercentage |
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| Final payment due at the end of the term |
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1,275,000us-gaap_DebtInstrumentPeriodicPaymentTermsBalloonPaymentToBePaid |
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| Facility Fee amount |
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75,000us-gaap_DebtInstrumentFeeAmount |
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| Loan interest description |
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Interest-only payments for 18 months followed by 30 equal monthly principal and interest payments |
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| Estimated fair value of warrants |
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(1,464,000)us-gaap_FairValueAdjustmentOfWarrants |
525,000us-gaap_FairValueAdjustmentOfWarrants |
(2,000)us-gaap_FairValueAdjustmentOfWarrants |
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| Initial Public offering, closing date |
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Jul. 22, 2014 |
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| Shares issued upon conversion |
510,777us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities |
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| Amortization of debt discount |
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256,000cdna_AmortizationOfDebtDiscount |
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| Extinguishment of embedded derivative |
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120,000us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability |
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| Illumina, Inc. [Member] |
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| Debt Instrument [Line Items] |
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| Annual interest rate |
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8.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_LegalEntityAxis
= cdna_IlluminaIncMember |
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| Subordinated convertible promissory note issued |
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5,000,000us-gaap_ConvertibleSubordinatedDebt
/ dei_LegalEntityAxis
= cdna_IlluminaIncMember |
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| Subordinated convertible promissory note maturity term |
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1 year |
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| Subordinated Convertible Promissory Notes [Member] |
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| Debt Instrument [Line Items] |
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| Annual interest rate |
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7.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_ShortTermDebtTypeAxis
= cdna_SubordinatedConvertiblePromissoryNotesMember |
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| Principal amount of notes |
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11,365,000cdna_ConvertibleSubordinatedNotesPrincipalAmount
/ us-gaap_ShortTermDebtTypeAxis
= cdna_SubordinatedConvertiblePromissoryNotesMember |
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| Amortization of debt discount |
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39,000us-gaap_AmortizationOfDebtDiscountPremium
/ us-gaap_ShortTermDebtTypeAxis
= cdna_SubordinatedConvertiblePromissoryNotesMember |
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| Series G Convertible Preferred Stock [Member] |
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| Debt Instrument [Line Items] |
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| Warrants to purchase stock of convertible preferred stock, shares |
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357,216us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_StatementClassOfStockAxis
= cdna_SeriesGConvertiblePreferredStockMember |
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| Warrants to purchase stock of convertible preferred stock, per share |
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$ 21.78us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_StatementClassOfStockAxis
= cdna_SeriesGConvertiblePreferredStockMember |
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| Principal and interest amount of notes |
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12,423,000us-gaap_ConvertibleNotesPayable
/ us-gaap_StatementClassOfStockAxis
= cdna_SeriesGConvertiblePreferredStockMember |
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| Convertible notes, shares |
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570,294us-gaap_DebtInstrumentConvertibleNumberOfEquityInstruments
/ us-gaap_StatementClassOfStockAxis
= cdna_SeriesGConvertiblePreferredStockMember |
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| Convertible notes, per share |
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$ 21.78us-gaap_DebtInstrumentConvertibleConversionPrice1
/ us-gaap_StatementClassOfStockAxis
= cdna_SeriesGConvertiblePreferredStockMember |
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| 2012 Loan [Member] | Series G Convertible Preferred Stock [Member] |
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| Debt Instrument [Line Items] |
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| Warrants to purchase stock of convertible preferred stock, shares |
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167,182us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_LongtermDebtTypeAxis
= cdna_TwoThousandTwelveTermLoanMember
/ us-gaap_StatementClassOfStockAxis
= cdna_SeriesGConvertiblePreferredStockMember |
| Warrants to purchase stock of convertible preferred stock, per share |
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$ 21.78us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_LongtermDebtTypeAxis
= cdna_TwoThousandTwelveTermLoanMember
/ us-gaap_StatementClassOfStockAxis
= cdna_SeriesGConvertiblePreferredStockMember |
| Warrants exercisable period |
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The warrants are exercisable until 2019 |
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| 2010 Loan [Member] |
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| Debt Instrument [Line Items] |
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| Amortization expense |
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4,400us-gaap_AmortizationOfFinancingCosts
/ us-gaap_LongtermDebtTypeAxis
= cdna_TwoThousandAndTenTermLoanMember |
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| 2010 Loan [Member] | Series G Convertible Preferred Stock [Member] |
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| Debt Instrument [Line Items] |
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| Warrants to purchase stock of convertible preferred stock, shares |
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17,215us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_LongtermDebtTypeAxis
= cdna_TwoThousandAndTenTermLoanMember
/ us-gaap_StatementClassOfStockAxis
= cdna_SeriesGConvertiblePreferredStockMember |
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| Warrants to purchase stock of convertible preferred stock, per share |
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$ 21.78us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_LongtermDebtTypeAxis
= cdna_TwoThousandAndTenTermLoanMember
/ us-gaap_StatementClassOfStockAxis
= cdna_SeriesGConvertiblePreferredStockMember |
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| Warrants exercisable period |
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The warrants were exercisable until 2017 |
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| Estimated fair value of warrants |
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$ 8,000us-gaap_FairValueAdjustmentOfWarrants
/ us-gaap_LongtermDebtTypeAxis
= cdna_TwoThousandAndTenTermLoanMember
/ us-gaap_StatementClassOfStockAxis
= cdna_SeriesGConvertiblePreferredStockMember |
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