Revenue - Summary of Revenues Disaggregated by Product Classification and Operating Segment (Detail) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disaggregation Of Revenue [Line Items]
Research, development and other	$ 2,394	$ 1,849
Total Revenue	22,241	17,013
Royalties [Member]
Disaggregation Of Revenue [Line Items]
Revenue	10,096	7,076
Operating Segments [Member]
Disaggregation Of Revenue [Line Items]
Total Revenue	22,241	17,013
Operating Segments [Member] | Medical Device [Member]
Disaggregation Of Revenue [Line Items]
Research, development and other	2,384	1,848
Total Revenue	17,258	12,774
Operating Segments [Member] | Medical Device [Member] | Product Sales [Member]
Disaggregation Of Revenue [Line Items]
Revenue	4,778	3,850
Operating Segments [Member] | Medical Device [Member] | Royalties [Member]
Disaggregation Of Revenue [Line Items]
Revenue	7,685	7,042
Operating Segments [Member] | Medical Device [Member] | License Fees [Member]
Disaggregation Of Revenue [Line Items]
Revenue	2,411	34
Operating Segments [Member] | In Vitro Diagnostics [Member]
Disaggregation Of Revenue [Line Items]
Total Revenue	4,983	4,239
Operating Segments [Member] | In Vitro Diagnostics [Member] | Product Sales [Member]
Disaggregation Of Revenue [Line Items]
Revenue	4,973	4,237
Operating Segments [Member] | In Vitro Diagnostics [Member] | Other [Member]
Disaggregation Of Revenue [Line Items]
Revenue	$ 10	$ 2