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Segment Reporting - Operating Results of Reportable Segments (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Segment Reporting Information [Line Items]
Revenues	$ 14,053	$ 11,584
Revenues- product revenue	3,307	3,667
Operating loss	(5,235)	(8,544)
Depreciation and amortization	1,039	934
Total assets	78,952		$ 83,565
Post-Transplant [Member]
Segment Reporting Information [Line Items]
Revenues	10,746	7,917
Revenues-testing and license and other revenue	10,746	7,917
Operating loss	(3,195)	(5,459)
Depreciation and amortization	329	262
Total assets	45,564		48,734
Pre-Transplant [Member]
Segment Reporting Information [Line Items]
Revenues	3,307	3,667
Revenues- product revenue	3,307	3,667
Operating loss	(2,040)	(3,085)
Depreciation and amortization	710	$ 672
Total assets	$ 33,388		$ 34,831

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- Definition

Testing and license and other revenues.

+ References

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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

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-Name Accounting Standards Codification
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-Section S99
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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
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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