Revenue - Summary of Revenues Disaggregated by Product Classification and Operating Segment (Detail) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disaggregation Of Revenue [Line Items]
Total revenue	$ 22,616	$ 22,241
Product Sales [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	9,974	9,751
Royalties [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	10,148	10,096
Research, Development and Other [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	2,494	2,394
Operating Segments [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	22,616	22,241
Operating Segments [Member] | Medical Device [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	17,404	17,258
Operating Segments [Member] | Medical Device [Member] | Product Sales [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	5,023	4,778
Operating Segments [Member] | Medical Device [Member] | Royalties [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	8,898	7,685
Operating Segments [Member] | Medical Device [Member] | Research, Development and Other [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	2,234	2,384
Operating Segments [Member] | Medical Device [Member] | License Fees [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	1,249	2,411
Operating Segments [Member] | In Vitro Diagnostics [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	5,212	4,983
Operating Segments [Member] | In Vitro Diagnostics [Member] | Product Sales [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	4,952	4,973
Operating Segments [Member] | In Vitro Diagnostics [Member] | Other [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	$ 260	$ 10