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Business Combination - Acquisition of Allenex - Schedule of Pro Forma Results of Operations (Detail) - Allenex [Member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Revenue: |  |
Testing revenue | $ 29,681 | $ 27,881
Product revenue | 15,101 | 15,957
Other revenue | 407 | 578
Total revenue | 45,189 | 44,416
Net loss | $ (32,319) | $ (17,050)

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