Revenue Recognition - Summary of Disaggregation of Revenue by Disease State (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Segment Reporting Information [Line Items]
Revenue	$ 111,231	$ 85,264	$ 199,572	$ 178,181
Revenue, % change	30.00%		12.00%
Diagnostics [Member]
Segment Reporting Information [Line Items]
Revenue	$ 41,103	31,949	$ 74,307	62,270
Revenue, % change	29.00%		19.00%
Diagnostics [Member] | Gastrointestinal Assays [Member]
Segment Reporting Information [Line Items]
Revenue	$ 20,281	15,666	$ 41,900	31,118
Revenue, % change	29.00%		35.00%
Diagnostics [Member] | Respiratory Illness Assays [Member]
Segment Reporting Information [Line Items]
Revenue	$ 9,491	3,686	$ 15,871	8,492
Revenue, % change	157.00%		87.00%
Diagnostics [Member] | Blood Chemistry Assays [Member]
Segment Reporting Information [Line Items]
Revenue	$ 3,425	4,358	$ 3,503	8,753
Revenue, % change	(21.00%)		(60.00%)
Diagnostics [Member] | Other [Member]
Segment Reporting Information [Line Items]
Revenue	$ 7,906	$ 8,239	$ 13,033	$ 13,907
Revenue, % change	(4.00%)		(6.00%)