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Segment Reporting - Operating Results of Reportable Segments (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Net revenues	$ 10,859	$ 12,475	$ 10,735	$ 6,562	$ 6,648	$ 7,151	$ 7,129	$ 7,216	$ 40,631	$ 28,144	$ 27,306
Operating loss									(37,332)	(11,932)	1,250
Depreciation and amortization									2,920	796	512
Total assets	76,730	$ 102,092	$ 100,453	$ 48,834	55,638	$ 59,342	$ 61,366	$ 63,277	76,730	55,638
CareDx [Member]
Segment Reporting Information [Line Items]
Net revenues									29,917	28,144	27,306
Operating loss									(18,374)	(11,932)	1,250
Depreciation and amortization									982	796	512
Total assets	41,169				55,638				41,169	55,638
Olerup [Member]
Segment Reporting Information [Line Items]
Net revenues									10,714	0	0
Operating loss									(18,958)	0	0
Depreciation and amortization									1,938	0	$ 0
Total assets	$ 35,561				$ 0				$ 35,561	$ 0

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- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(12))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 210
-Section S99
-Paragraph 1
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 28
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+ References

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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