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Revenue - Summary of Disaggregation of Revenue Within Reportable Segment (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | $ 132,584 | $ 99,951 | $ 105,136
Product Sales [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | 60,614 | 54,621 | 46,478
Royalties & License Fees - Performance Coatings [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | 62,398 | 36,248 | 47,056
Research, Development and Other [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | 9,572 | 9,082 | 11,602
Operating Segments [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | 132,584 | 99,951 | 105,136
Operating Segments [Member] | Medical Device [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | 105,783 | 72,389 | 78,253
Operating Segments [Member] | Medical Device [Member] | Product Sales [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | 34,126 | 27,930 | 21,777
Operating Segments [Member] | Medical Device [Member] | Royalties & License Fees - Performance Coatings [Member] | Performance Coatings [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | 32,812 | 30,547 | 31,007
Operating Segments [Member] | Medical Device [Member] | License Fees - SurVeil DCB [Member] | SurVeil DCB - Abbott Agreement [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | 29,586 | 5,701 | 16,049
Operating Segments [Member] | Medical Device [Member] | Research, Development and Other [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | 9,259 | 8,211 | 9,420
Operating Segments [Member] | In Vitro Diagnostics [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | 26,801 | 27,562 | 26,883
Operating Segments [Member] | In Vitro Diagnostics [Member] | Product Sales [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | 26,488 | 26,691 | 24,701
Operating Segments [Member] | In Vitro Diagnostics [Member] | Research, Development and Other [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | $ 313 | $ 871 | $ 2,182

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