Revenue Recognition - Summary of Disaggregation of Revenue by Disease State (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Revenue	$ 333,018	$ 317,896	$ 253,667
Diagnostics [Member]
Segment Reporting Information [Line Items]
Revenue	155,903	127,760	121,132
Diagnostics [Member] | Gastrointestinal Assays [Member]
Segment Reporting Information [Line Items]
Revenue	87,568	68,890	55,040
Diagnostics [Member] | Respiratory Illness Assays [Member]
Segment Reporting Information [Line Items]
Revenue	26,632	17,608	26,694
Diagnostics [Member] | Blood Chemistry Assays [Member]
Segment Reporting Information [Line Items]
Revenue	14,189	15,398	17,534
Diagnostics [Member] | Other [Member]
Segment Reporting Information [Line Items]
Revenue	$ 27,514	$ 25,864	$ 21,864