Revenue - Summary of Revenues Disaggregated by Product Classification and Reportable Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Disaggregation Of Revenue [Line Items]
Total revenue	$ 105,136	$ 94,864	$ 100,077
Product Sales [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	46,478	44,317	40,219
Royalties [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	47,056	40,634	48,458
Research, Development and Other [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	11,602	9,913	11,400
Operating Segments [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	105,136	94,864	100,077
Operating Segments [Member] | Medical Device [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	78,253	71,401	78,353
Operating Segments [Member] | Medical Device [Member] | Product Sales [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	21,777	21,608	18,617
Operating Segments [Member] | Medical Device [Member] | Royalties [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	30,781	28,614	34,781
Operating Segments [Member] | Medical Device [Member] | License Fees [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	16,275	12,020	13,678
Operating Segments [Member] | Medical Device [Member] | Research, Development and Other [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	9,420	9,159	11,277
Operating Segments [Member] | In Vitro Diagnostics [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	26,883	23,463	21,724
Operating Segments [Member] | In Vitro Diagnostics [Member] | Product Sales [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	24,701	22,709	21,390
Operating Segments [Member] | In Vitro Diagnostics [Member] | Other [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	$ 2,182	$ 754	$ 334