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Subsequent Events - Additional Information (Detail) - Subsequent Event [Member] - USD ($) | May 08, 2018 | Apr. 17, 2018
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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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