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Goodwill and Intangible Assets - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2016 USD ($) ReportingUnit | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Goodwill And Intangible Assets [Line Items] |  |  |
Number of reporting units | ReportingUnit | 2 |  |
Description of annual goodwill impairment test | The Company tested its goodwill for impairments as of December 1, 2016. The Company performed step one of its annual Goodwill impairment test |  |
Goodwill impairment | $ 13,021,000 | $ 0 | $ 0
Amortization expense of intangible assets | 1,700,000 | $ 0 |
Acquired in-process research and development | 6,700,000 |  |
Cost of Product [Member] |  |  |
Goodwill And Intangible Assets [Line Items] |  |  |
Amortization expense of intangible assets | 1,000,000 |  |
Sales and marketing [Member] |  |  |
Goodwill And Intangible Assets [Line Items] |  |  |
Amortization expense of intangible assets | $ 700,000 |  |
Olerup [Member] |  |  |
Goodwill And Intangible Assets [Line Items] |  |  |
Description of goodwill impairment method for fair value determination | determined that the fair value of the Olerup reporting unit was $1.7 million, which was lower than its carrying value. |  |
Reporting unit, amount of fair value in excess of carrying value | $ 1,700,000 |  |
Goodwill impairment | $ 13,000,000 |  |
Reporting unit, percentage of fair value | 10.00% |  |
Reporting unit, discount rate | 16.80% |  |
Reporting unit, terminal growth rate | 3.20% |  |
Reporting unit, capitalization multiple | $ 7.37 |  |
Olerup [Member] | Maximum [Member] |  |  |
Goodwill And Intangible Assets [Line Items] |  |  |
Goodwill impairment | $ 630,000 |  |
CareDx [Member] | Maximum [Member] |  |  |
Goodwill And Intangible Assets [Line Items] |  |  |
Reporting unit, percentage of fair value | 75.00% |  |

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- Definition Indefinite lived intangible assets excluding goodwill gross. + References No definition available. + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Description of how the fair value of the impaired goodwill of the reporting unit was determined for goodwill valuation purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 35 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=66047195&loc=d3e12382-109265 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 35 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=66047195&loc=d3e12407-109265 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 35 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=66047195&loc=d3e12414-109265 + Details
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- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Number of reporting units tested for impairment of goodwill. A reporting unit is an operating segment or one level below an operating segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Reporting Unit -URI http://asc.fasb.org/extlink&oid=6523643 + Details
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