Revenue Recognition - Summary of Disaggregation of Revenue by Disease State (Detail) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Revenue	$ 88,341	$ 92,917
Revenue, % change	(5.00%)
Diagnostics [Member]
Segment Reporting Information [Line Items]
Revenue	$ 33,204	30,321
Revenue, % change	10.00%
Diagnostics [Member] | Gastrointestinal Assays [Member]
Segment Reporting Information [Line Items]
Revenue	$ 21,619	15,452
Revenue, % change	40.00%
Diagnostics [Member] | Respiratory Illness Assays [Member]
Segment Reporting Information [Line Items]
Revenue	$ 6,380	4,806
Revenue, % change	33.00%
Diagnostics [Member] | Blood Chemistry Assays [Member]
Segment Reporting Information [Line Items]
Revenue	$ 78	4,394
Revenue, % change	(98.00%)
Diagnostics [Member] | Other [Member]
Segment Reporting Information [Line Items]
Revenue	$ 5,127	$ 5,669
Revenue, % change	(10.00%)