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Collaborative Arrangement - Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2023 | Mar. 31, 2022 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2022
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |
Total revenue | $ 27,198,000 | $ 26,106,000 | $ 52,131,000 | $ 49,109,000 |  |  |  |  |
Deferred revenue |  |  |  |  |  |  |  |  | $ 9,200,000
Abbott Agreement [Member] |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |
Collaborative arrangement payment received |  |  | 60,800,000 |  |  |  |  |  |
Total revenue | 1,300,000 | $ 1,400,000 | 2,600,000 |  |  |  |  |  |
Collaboration revenue recognized included in balance at beginning of period |  |  | 2,600,000 | $ 2,600,000 |  |  |  |  |
Deferred revenue | 6,600,000 |  | 6,600,000 |  |  |  |  |  |
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] | PMA Received After December 31, 2022 [Member] | TRANSCEND Clinical Trial [Member] |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |
Collaborative arrangement additional potential milestone payments receivable | $ 24,000,000 |  | $ 24,000,000 |  |  |  |  |  |

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