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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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