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Goodwill and Intangible Assets - Summary of Goodwill (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Indefinite Lived Intangible Assets By Major Class [Line Items] |  |  |
Balance as of December 31, 2015 | $ 12,005 |  |
Goodwill acquired | 16,922 |  |
Goodwill impairment | (13,021) | $ 0 | $ 0
Foreign currency translation adjustments | (2,067) |  |
Balance as of December 31, 2016 | 13,839 | 12,005 |
CareDx [Member] |  |  |
Indefinite Lived Intangible Assets By Major Class [Line Items] |  |  |
Balance as of December 31, 2015 | 12,005 |  |
Goodwill acquired | 0 |  |
Goodwill impairment | 0 |  |
Foreign currency translation adjustments | 0 |  |
Balance as of December 31, 2016 | 12,005 | 12,005 |
Allenex [Member] |  |  |
Indefinite Lived Intangible Assets By Major Class [Line Items] |  |  |
Balance as of December 31, 2015 | 0 |  |
Goodwill acquired | 16,922 |  |
Goodwill impairment | (13,021) |  |
Foreign currency translation adjustments | (2,067) |  |
Balance as of December 31, 2016 | $ 1,834 | $ 0 |

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- Definition Amount after accumulated impairment loss of an asset representing 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 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits 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 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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