Collaborative Arrangement - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	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