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Collaborative Arrangement - Additional Information (Detail) - USD ($) | 12 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |
Total revenue | $ 105,136,000 | $ 94,864,000 | $ 100,077,000 |
Abbott Agreement [Member] |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |
Collaborative arrangement payment received | 60,800,000 |  |  |
Collaborative arrangement additional potential milestone payments receivable | 30,000,000 |  |  |
Total revenue | 16,000,000.0 | 12,000,000.0 | 13,500,000 |
Upfront and milestone fee payment included in deferred revenue | 14,900,000 | 15,900,000 |  |
Collaboration revenue recognized included in balance at beginning of period | 4,700,000 | 5,000,000.0 | 8,400,000 |
Abbott Agreement [Member] | Contract Life to Date [Member] |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |
Total revenue | 45,900,000 |  |  |
Abbott Agreement [Member] | Upfront Payment [Member] |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |
Collaborative arrangement payment received |  |  |  | $ 25,000,000
Abbott Agreement [Member] | Milestone Payment [Member] |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |
Collaborative arrangement payment received | 15,000,000 | $ 10,800,000 | $ 10,000,000 |
Abbott Agreement [Member] | Maximum [Member] | PMA Milestone [Member] | TRANSCEND Clinical Trial [Member] |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |
Collaborative arrangement additional potential milestone payments receivable | $ 30,000,000 |  |  |

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