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Subsequent Events - Additional Information (Detail) - Subsequent Event [Member] - USD ($)	May 08, 2018	Apr. 17, 2018
Illumina [Member]
Subsequent Event [Line Items]
Initial payment under license agreement	$ 5,000,000
Tranche B Term Loan [Member]
Subsequent Event [Line Items]
Fee payable equal to percentage of principal amount		1.75%
Tranche B Term Loan [Member] | Tranche B Warrant [Member]
Subsequent Event [Line Items]
Warrant to purchase stock, shares		93,333
Term Loan Facility [Member]
Subsequent Event [Line Items]
Interest rate		9.00%
Interest rate, description		The Term Loan accrues interest per annum at 9.00% (the “Applicable Margin”) plus the greater of the one-month LIBOR or 1.5%.
Interest rate basis spread		1.50%
Debt instrument maturity date		Apr. 17, 2023
Term Loan Facility [Member] | CareDx International AB [Member]
Subsequent Event [Line Items]
Debt secured assets and pledge equity interests percentage		65.00%
Perceptive Credit Agreement [Member]
Subsequent Event [Line Items]
Amount of fee paid		$ 262,500
Increase in interest rate in case of default		3.00%
Perceptive Credit Agreement [Member] | Tranche A Warrant [Member]
Subsequent Event [Line Items]
Warrant to purchase stock, shares		140,000
Warrant initial exercise price		$ 8.60
Warrant termination date		Apr. 17, 2025
Perceptive Credit Agreement [Member] | Tranche A Term Loan [Member]
Subsequent Event [Line Items]
Aggregate principal amount		$ 15,000,000
Proceeds from term loan		11,100,000
Perceptive Credit Agreement [Member] | Tranche B Term Loan [Member]
Subsequent Event [Line Items]
Aggregate principal amount		$ 10,000,000

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 235
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