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Stock Incentive Plans - Schedule of Outstanding, Exercisable and Vested Stock Options (Detail) (USD $)
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12 Months Ended |
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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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Dec. 31, 2011
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| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
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| Options Outstanding, Range of Exercise Prices |
$ 7.36us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice |
$ 1.99us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice |
$ 2.67us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice |
$ 3.70us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice |
| Options Outstanding & Exercisable, Number of Options Outstanding |
1,031,804cdna_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingAndExercisableOptions |
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| Options Outstanding & Exercisable, Weighted Average Remaining Contractual Life (Years) |
8 years |
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| Options Outstanding & Exercisable, Weighted Average Exercise Price |
$ 7.36cdna_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingAndExercisableOptionsWeightedAverageExercisePrice |
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| Options Vested, Number of Options |
415,401cdna_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedOutstandingNumber |
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| Number of Options vested, Weighted Average Exercise Price |
$ 2.68cdna_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedWeightedAverageExercisePrice |
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| $0.27-0.55 [Member] |
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| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
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| Options Outstanding & Exercisable, Number of Options Outstanding |
200,002cdna_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingAndExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= cdna_ExercisePriceRangeOneMember |
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| Options Outstanding & Exercisable, Weighted Average Remaining Contractual Life (Years) |
7 years 9 months 18 days |
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| Options Outstanding & Exercisable, Weighted Average Exercise Price |
$ 0.55cdna_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingAndExercisableOptionsWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= cdna_ExercisePriceRangeOneMember |
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| Options Vested, Number of Options |
136,560cdna_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedOutstandingNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= cdna_ExercisePriceRangeOneMember |
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| Number of Options vested, Weighted Average Exercise Price |
$ 0.55cdna_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= cdna_ExercisePriceRangeOneMember |
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| $0.27-0.55 [Member] | Minimum [Member] |
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| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
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| Options Outstanding, Range of Exercise Prices |
$ 0.27us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= cdna_ExercisePriceRangeOneMember |
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| $0.27-0.55 [Member] | Maximum [Member] |
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| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
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| Options Outstanding, Range of Exercise Prices |
$ 0.55us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= cdna_ExercisePriceRangeOneMember |
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| $2.05-3.01 [Member] |
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| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
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| Options Outstanding & Exercisable, Number of Options Outstanding |
153,469cdna_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingAndExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= cdna_ExercisePriceRangeTwoMember |
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| Options Outstanding & Exercisable, Weighted Average Remaining Contractual Life (Years) |
6 years 4 months 10 days |
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| Options Outstanding & Exercisable, Weighted Average Exercise Price |
$ 2.78cdna_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingAndExercisableOptionsWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= cdna_ExercisePriceRangeTwoMember |
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| Options Vested, Number of Options |
147,641cdna_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedOutstandingNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= cdna_ExercisePriceRangeTwoMember |
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| Number of Options vested, Weighted Average Exercise Price |
$ 2.77cdna_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= cdna_ExercisePriceRangeTwoMember |
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| $2.05-3.01 [Member] | Minimum [Member] |
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| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
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| Options Outstanding, Range of Exercise Prices |
$ 2.05us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= cdna_ExercisePriceRangeTwoMember |
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| $2.05-3.01 [Member] | Maximum [Member] |
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| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
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| Options Outstanding, Range of Exercise Prices |
$ 3.01us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= cdna_ExercisePriceRangeTwoMember |
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| $3.36-3.97 [Member] |
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| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
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| Options Outstanding & Exercisable, Number of Options Outstanding |
110,188cdna_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingAndExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= cdna_ExercisePriceRangeThreeMember |
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| Options Outstanding & Exercisable, Weighted Average Remaining Contractual Life (Years) |
3 years 6 months 18 days |
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| Options Outstanding & Exercisable, Weighted Average Exercise Price |
$ 3.47cdna_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingAndExercisableOptionsWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= cdna_ExercisePriceRangeThreeMember |
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| Options Vested, Number of Options |
110,188cdna_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedOutstandingNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= cdna_ExercisePriceRangeThreeMember |
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| Number of Options vested, Weighted Average Exercise Price |
$ 3.47cdna_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= cdna_ExercisePriceRangeThreeMember |
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| $3.36-3.97 [Member] | Minimum [Member] |
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| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
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| Options Outstanding, Range of Exercise Prices |
$ 3.36us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= cdna_ExercisePriceRangeThreeMember |
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| $3.36-3.97 [Member] | Maximum [Member] |
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| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
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| Options Outstanding, Range of Exercise Prices |
$ 3.97us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= cdna_ExercisePriceRangeThreeMember |
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| $7.03-12.40 [Member] |
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| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
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| Options Outstanding & Exercisable, Number of Options Outstanding |
568,145cdna_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingAndExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= cdna_ExercisePriceRangeFourMember |
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| Options Outstanding & Exercisable, Weighted Average Remaining Contractual Life (Years) |
9 years 4 months 17 days |
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| Options Outstanding & Exercisable, Weighted Average Exercise Price |
$ 11.75cdna_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingAndExercisableOptionsWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= cdna_ExercisePriceRangeFourMember |
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| Options Vested, Number of Options |
21,012cdna_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedOutstandingNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= cdna_ExercisePriceRangeFourMember |
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| Number of Options vested, Weighted Average Exercise Price |
$ 11.82cdna_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= cdna_ExercisePriceRangeFourMember |
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| $7.03-12.40 [Member] | Minimum [Member] |
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| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
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| Options Outstanding, Range of Exercise Prices |
$ 7.03us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= cdna_ExercisePriceRangeFourMember |
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| $7.03-12.40 [Member] | Maximum [Member] |
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| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
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| Options Outstanding, Range of Exercise Prices |
$ 12.40us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= cdna_ExercisePriceRangeFourMember |
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