Geographic, product and industry information - By Industry (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	$ 48,127	$ 31,204	$ 90,145	$ 59,364
Industrial chemicals/materials
Segment Reporting Information [Line Items]
Revenue	14,082	8,661	26,800	15,793
Academic research
Segment Reporting Information [Line Items]
Revenue	9,485	5,648	17,372	10,549
Healthcare
Segment Reporting Information [Line Items]
Revenue	24,111	16,564	44,971	32,540
Food/agricultural
Segment Reporting Information [Line Items]
Revenue	$ 449	$ 331	$ 1,002	$ 482