Collaborative Arrangement - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended		12 Months Ended
	Mar. 31, 2024	Jun. 30, 2023	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2023
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Total revenue	$ 31,958		$ 27,198	$ 62,510	$ 52,131
Revenue recognized included in deferred revenue balance at beginning of period				2,200	2,600
Deferred revenue, total	4,700			4,700						$ 6,800
Royalties and License Fees [Member]
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Total revenue	11,411		$ 9,429	20,590	$ 18,194
Abbott Agreement [Member]
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Collaborative arrangement payment received				87,800
Deferred revenue, total	$ 4,500			$ 4,500
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