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Collaborative Arrangement - Additional Information (Detail) - Abbott [Member] - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Sep. 30, 2018
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |
Upfront fee received |  |  |  | $ 45,800,000 |  | $ 25,000,000
Collaborative arrangement milestone payment received | $ 10,800,000 | $ 10,000,000.0 |  |  |  |
Collaboration revenue recognized | 7,600,000 |  | $ 2,000,000.0 | 10,400,000 | $ 5,900,000 |
Upfront and milestone fee payment included in deferred revenue | 17,500,000 | $ 17,100,000 |  | 17,500,000 |  |
Collaboration revenue recognized included in balance at beginning of period |  |  |  | 3,700,000 | $ 5,900,000 |
Maximum [Member] |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |
Collaborative arrangement additional potential milestone payments receivable | $ 45,000,000 |  |  | $ 45,000,000 |  |

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