Revenue - Summary of Revenues Disaggregated by Product Classification and Reportable Segment (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Disaggregation Of Revenue [Line Items]
Total revenue	$ 22,543	$ 26,883	$ 22,822	$ 22,616	$ 30,816	$ 24,344	$ 22,676	$ 22,241	$ 94,864	$ 100,077	$ 81,336
Product Sales [Member]
Disaggregation Of Revenue [Line Items]
Total revenue									44,317	40,219	37,953
Royalties [Member]
Disaggregation Of Revenue [Line Items]
Total revenue									40,634	48,458	35,424
Research, Development and Other [Member]
Disaggregation Of Revenue [Line Items]
Total revenue									9,913	11,400	7,959
Operating Segments [Member]
Disaggregation Of Revenue [Line Items]
Total revenue									94,864	100,077	81,336
Operating Segments [Member] | Medical Device [Member]
Disaggregation Of Revenue [Line Items]
Total revenue									71,401	78,353	60,513
Operating Segments [Member] | Medical Device [Member] | Product Sales [Member]
Disaggregation Of Revenue [Line Items]
Total revenue									21,608	18,617	17,200
Operating Segments [Member] | Medical Device [Member] | Royalties [Member]
Disaggregation Of Revenue [Line Items]
Total revenue									28,614	34,781	30,606
Operating Segments [Member] | Medical Device [Member] | License Fees [Member]
Disaggregation Of Revenue [Line Items]
Total revenue									12,020	13,678	4,818
Operating Segments [Member] | Medical Device [Member] | Research, Development and Other [Member]
Disaggregation Of Revenue [Line Items]
Total revenue									9,159	11,277	7,889
Operating Segments [Member] | In Vitro Diagnostics [Member]
Disaggregation Of Revenue [Line Items]
Total revenue									23,463	21,724	20,823
Operating Segments [Member] | In Vitro Diagnostics [Member] | Product Sales [Member]
Disaggregation Of Revenue [Line Items]
Total revenue									22,709	21,390	20,789
Operating Segments [Member] | In Vitro Diagnostics [Member] | Other [Member]
Disaggregation Of Revenue [Line Items]
Total revenue									$ 754	$ 334	$ 34