Revenue Recognition - Summary of Disaggregation of Revenue by Disease State (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Revenue	$ 63,511	$ 84,797	$ 241,692	$ 189,514
Revenue, % change	(25.00%)		28.00%
Diagnostics [Member]
Segment Reporting Information [Line Items]
Revenue	$ 31,189	21,598	$ 93,459	91,331
Revenue, % change	44.00%		2.00%
Diagnostics [Member] | Gastrointestinal Assays [Member]
Segment Reporting Information [Line Items]
Revenue	$ 17,844	9,584	$ 48,962	39,644
Revenue, % change	86.00%		24.00%
Diagnostics [Member] | Respiratory Illness Assays [Member]
Segment Reporting Information [Line Items]
Revenue	$ 3,742	5,052	$ 12,233	23,664
Revenue, % change	(26.00%)		(48.00%)
Diagnostics [Member] | Blood Chemistry Assays [Member]
Segment Reporting Information [Line Items]
Revenue	$ 4,254	3,364	$ 13,006	12,508
Revenue, % change	26.00%		4.00%
Diagnostics [Member] | Other [Member]
Segment Reporting Information [Line Items]
Revenue	$ 5,349	$ 3,598	$ 19,258	$ 15,515
Revenue, % change	49.00%		24.00%