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Segment Reporting - Reportable Revenues by Geographic Regions (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Segment Reporting Information [Line Items] |  |
Revenues | $ 14,053 | $ 11,584
Post-Transplant [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 10,746 | 7,917
Pre-Transplant [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 3,307 | 3,667
North America [Member] | Post-Transplant [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 10,729 | 7,902
North America [Member] | Pre-Transplant [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 929 | 1,000
Europe [Member] | Post-Transplant [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 17 | 15
Europe [Member] | Pre-Transplant [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 1,973 | 2,059
Australia [Member] | Post-Transplant [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 0 | 0
Australia [Member] | Pre-Transplant [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 74 | 116
Rest of The World [Member] | Post-Transplant [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 0 | 0
Rest of The World [Member] | Pre-Transplant [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | $ 331 | $ 492

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- Definition 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 + Details
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- Definition 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. + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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- Details
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