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Revenue - Summary of Revenues Disaggregated by Product Classification and Operating Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue | $ 30,816 | $ 24,344 | $ 22,676 | $ 22,241 | $ 23,038 | $ 22,227 | $ 19,058 | $ 17,013 | $ 100,077 | $ 81,336 | $ 73,112
Product Sales [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 40,219 | 37,953 | 32,790
Royalties [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  | $ 1,000 |  |  |  |  |  |  | 48,458 | 35,424 | 31,787
Research, Development and Other [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 11,400 | 7,959 | 8,535
Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 100,077 | 81,336 | 73,112
Operating Segments [Member] | Medical Device [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 78,353 | 60,513 | 53,983
Operating Segments [Member] | Medical Device [Member] | Product Sales [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 18,617 | 17,200 | 13,735
Operating Segments [Member] | Medical Device [Member] | Royalties [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 34,781 | 30,606 | 30,264
Operating Segments [Member] | Medical Device [Member] | Research, Development and Other [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 11,277 | 7,889 | 8,528
Operating Segments [Member] | Medical Device [Member] | License Fees [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 13,678 | 4,818 | 1,456
Operating Segments [Member] | In Vitro Diagnostics [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 21,724 | 20,823 | 19,129
Operating Segments [Member] | In Vitro Diagnostics [Member] | Product Sales [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 21,390 | 20,789 | 19,055
Operating Segments [Member] | In Vitro Diagnostics [Member] | Other [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | $ 334 | $ 34 | $ 74

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