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Collaborative Arrangement - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |
Total revenue | $ 132,584 | $ 99,951 | $ 105,136 |  |  |
Abbott Agreement [Member] |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |
Collaborative arrangement payment received | 87,800 |  |  |  |  |
Total revenue | 87,800 |  |  |  |  |
Upfront and milestone fee payment included in deferred revenue | 6,600 | 9,200 |  |  |  |
Collaboration revenue recognized included in balance at beginning of period | 4,600 | $ 5,700 | 4,700 |  |  |
Abbott Agreement [Member] | Contract Life to Date [Member] |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |
Total revenue | 81,200 |  |  |  |  |
Abbott Agreement [Member] | Upfront Payment [Member] |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |
Collaborative arrangement payment received |  |  |  |  |  | $ 25,000
Abbott Agreement [Member] | Milestone Payment [Member] |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |
Collaborative arrangement payment received | $ 27,000 |  | $ 15,000 | $ 10,800 | $ 10,000 |

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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479837/606-10-45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-8 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479837/606-10-45-2 + Details
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